JP2008027335A - Storage system, data migration method of storage system, and data migration device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage system for eliminating the need of work for data erasure performed after data migration and a computer system and dedicated hardware which are needed for data erasure by erasing data of a migration source storage device by a data migration device, and to provide the data migration method and the data migration device of the storage system. <P>SOLUTION: The data migration device 1 is provided with a data migration means 12 for migrating data from a first storage device 3 to a second storage device 4 in response to a write/read instruction, erasing data of the first storage device 3 after data migration and erasing all of the data of the first storage device 3 when all data migration is completed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a storage system, a storage system data migration method, and a data migration apparatus, and in particular, without using a separate system or special hardware for erasing data in a data migration source storage apparatus after data migration. The present invention relates to a storage system capable of erasing data in parallel with the data migration work, a data migration method for the storage system, and a data migration apparatus.

  In recent years, with the increase in the amount of data stored and the size of data handled in computer systems, the opportunity to replace storage devices that store data with larger capacity storage devices has increased.

  In addition, virtual tape devices that receive data I / O commands from a host computer to a magnetic tape device and store data in a disk array device have come to be used as computer systems. In some cases, the current magnetic tape library apparatus is replaced with a new virtual tape library apparatus.

  When migrating data from such a current storage device to a new storage device, the computer system can access data stored in the current storage device from the host computer, that is, a computer that migrates data during system operation. (For example, refer to Patent Document 1).

  In Patent Document 1, data is written to the migration destination storage apparatus in response to a data write command from the host computer. In response to a data read command, if the target data is in the migration destination storage apparatus, the data is read from the migration destination storage apparatus and transmitted to the host computer. When the target data does not exist in the migration destination storage apparatus, the data is read from the migration source storage apparatus and transmitted to the host computer, and the data is written to the migration destination storage apparatus. Furthermore, data migration from the migration source storage apparatus to the migration destination storage apparatus is performed in the background regardless of the host I / O.

  By the way, the migration source storage apparatus after the completion of data migration needs to completely erase the data before discarding or diverting from the viewpoint of information security.

  However, in the technique of Patent Document 1, all writing from the host computer is performed on the migration destination storage, and no data is written on the migration source storage, so there is no means for erasing the data on the migration source storage. .

  Therefore, it is necessary to connect the migration source storage to another computer system after the data migration is completed, or to erase the data by using dedicated hardware, and the above technique is inefficient. It is.

US Pat. No. 6,108,748

  In the technique of Patent Document 1, old data remains in the migration source storage apparatus after data migration. Therefore, when discarding the migration source storage device or diverting it to another computer system, either connect the migration source storage device to another computer system and delete the data, or use the dedicated hardware. There is a problem that it is necessary to make the data in an unreadable state.

  An object of the present invention is to erase data of a migration source storage device by a data migration device, work for erasing data performed after data migration, a storage system that does not require a computer system or dedicated hardware necessary for data erasure, The object is to provide a data migration method and a data migration apparatus for a storage system.

  The storage system of the present invention includes a host computer, a first storage device and a second storage device that write and read data according to instructions from the host computer, and data that migrates data from the first storage device to the second storage device. In the storage system having the migration apparatus, the data migration apparatus manages the first storage apparatus and the second storage apparatus for storing the data of the write / read command from the host computer, the first storage apparatus, It is characterized by having means for managing whether or not the data for which data migration of the storage device has been completed has been erased, and means for erasing the data of the first storage device for which data migration has been completed.

  The data migration apparatus includes data migration completion notifying means for notifying the host computer of completion of data migration when all data migration and all data erasure of the first storage device are completed.

  The storage system of the present invention includes a host computer, a first storage device and a second storage device that write and read data according to instructions from the host computer, and data that migrates data from the first storage device to the second storage device. In a storage system having a migration device, the data migration device includes host I / O processing means for transmitting / receiving commands and data to / from the host computer, and write / read command data from the host computer to the first storage device. Data management unit for managing the data storage unit and the second storage device, data migration means for performing data migration processing based on information of the data management unit, and data of the first storage device that has completed data migration Erasing means, all data migration and first Data migration completion notifying means for notifying the host computer or the self device that all data in the storage device has been erased, and the data management unit determines whether or not the data migration of the first storage device has been completed. It has a data management table for managing.

  The data management table has a block number and a migrated flag indicating whether or not the data of the block number has been migrated to the second storage device.

  The data migration completion notification means has display means or alarm sounding means.

  The data migration apparatus has a first storage I / O issuing means for issuing an I / O to the first storage apparatus, and a second storage I / O issuing means for issuing an I / O to the second storage apparatus, The data migration means includes means for controlling the first storage I / O issuing means and the second storage I / O issuing means.

  Both the first storage device and the second storage device have a random access type drive that performs writing and reading in block units.

  When a data read command is received from the host computer, the data migration device, if the data migration of the read command is not executed, means for reading the data of the read command from the first storage device, and the read data to the second storage device And a means for erasing the read block data of the first storage device.

  When the data migration command is received from the host computer, the data migration device, when data migration of the write command is not executed, means for writing the data of the write command to the second storage device and the block written to the second storage device And means for erasing block data of the first storage device corresponding to.

  The storage system of the present invention includes a host computer, a first storage device and a second storage device that write and read data according to instructions from the host computer, and data that migrates data from the first storage device to the second storage device. In a storage system having a migration device, the data migration device includes host I / O processing means for transmitting / receiving commands and data to / from the host computer, and write / read command data from the host computer to the first storage device. Data management unit for managing the data storage unit and the second storage device, data migration means for performing data migration processing based on information of the data management unit, and data of the first storage device that has completed data migration The erasing means and the second storage device Virtualization means for performing control that emulates the first storage device, and data migration completion notification means for notifying the host computer or its own device that all data migration and all data erasure of the first storage device have been completed The data management unit has a data management table for managing whether or not the data migration of the first storage device has been completed.

  The first storage device has a magnetic tape library device, and the second storage device has a disk array device.

  The data management table includes a volume number for all the volumes stored in the first storage device, a migrated flag indicating whether the volume data has been migrated to the second storage device, and the last block after the data migration. And a shifted block position indicating the position.

  The data migration completion notification means has display means or alarm sounding means.

  The data migration device issues a first storage I / O issuing unit that issues an I / O to the first storage device and a second storage I / O issue that issues an I / O to the second storage device via the virtualization unit. And the data migration means includes means for controlling the first storage I / O issuing means and the second storage I / O issuing means.

  When the data migration command is received from the host computer, the data migration device reads the data from the volume of the first storage device and transfers it to the host computer when the data migration of the read command is not executed, and the second storage Means for writing the read data to the volume of the device, means for updating the migrated block position corresponding to the volume number in the data management table, and whether the data read from the volume of the first storage device is the end To determine whether or not the data migration is complete, means to set the migrated flag corresponding to the volume number to migrated when the data migration is complete, and whether data migration of all volumes from the data management table is complete Means to determine whether or not the data migration is complete And having a means for erasing the data of all the volumes in the storage apparatus.

  When the data migration command is received from the host computer, the data migration device performs data migration from the means for writing the data of the write command to the volume in the second storage device and the migrated flag corresponding to the volume number in the data management table. Means for determining whether or not data migration is complete, means for migrating the migrated flag corresponding to the volume number when data migration of the write command is incomplete, and whether data migration of all volumes from the data management table is complete A means for judging whether or not, and a means for erasing data of all the volumes in the first storage device when the data migration is completed.

  The data management unit has a drive status table for managing the status of the drives in the first storage device in addition to the data management table. The data management table includes volume numbers for all volumes stored in the first storage device. , A migrated flag indicating whether or not the volume data has been migrated to the second storage device, a migrated block location indicating the last block location after the data migration, and data erasure of the volume in the first storage device are complete And an erased flag indicating whether or not it has been performed.

  The drive status table has a unique drive number and a drive status indicating the usage status of the drive corresponding to the drive number.

  The data management unit has a drive status table for managing the status of the drives in the first storage device in addition to the data management table. The data management table includes volume numbers for all volumes stored in the first storage device. , A migrated flag indicating whether or not the volume data has been migrated to the second storage device, a migrated block location indicating the last block location after the data migration, and data erasure of the volume in the first storage device are complete And an erased flag indicating whether or not the data has been erased, and an erased sector position indicating the sector position where data erasure of the volume has been completed.

  The drive status table has a unique drive number and a drive status indicating the usage status of the drive corresponding to the drive number.

  The data migration method of the storage system of the present invention includes a host computer, a first storage device and a second storage device that write / read data according to instructions from the host computer, and data from the first storage device to the second storage device. In a data migration method for a storage system having a data migration device that performs migration, the data migration device sends and receives instructions and data to and from the host computer by the host I / O processing means, and writes from the host computer A step of managing by the data management unit whether the data of the read command is stored in the first storage device or the second storage device, and performing data migration processing based on the information of the data management unit by the data migration unit Complete steps and data migration Erasing the data in the first storage device, and notifying the host computer or its own device by the data migration completion notifying means that all data migration and all data erasure in the first storage device have been completed. The data management unit has a step of managing whether or not the data migration of the first storage device has been completed using the data management table.

  Both the first storage device and the second storage device have a random access type drive that performs writing and reading in block units.

  The data management table has a block number and a migrated flag indicating whether or not the data of the block number has been migrated to the second storage device.

  When a data read command is received from the host computer, the data migration device reads the read command data from the first storage device when the data migration of the read command is not executed, and the read data is sent to the second storage device. And a step of erasing the read block data of the first storage device.

  When the data migration command is received from the host computer, the data migration device writes the data of the write command to the second storage device and the block written to the second storage device if the data migration of the write command has not been executed. Erasing the block data of the first storage device corresponding to.

  The data migration method of the storage system of the present invention includes a host computer, a first storage device and a second storage device that write / read data according to instructions from the host computer, and data from the first storage device to the second storage device. In a data migration method for a storage system having a data migration device that performs migration, the data migration device sends and receives instructions and data to and from the host computer by the host I / O processing means, and writes from the host computer A step of managing by the data management unit whether the data of the read command is stored in the first storage device or the second storage device, and performing data migration processing based on the information of the data management unit by the data migration unit Complete steps and data migration Erasing the data in the first storage device, performing the control of virtualizing the second storage device by the virtualization means and emulating the first storage device, and transferring all data by the data migration completion notification means. A step of notifying the host computer or its own device that all the data in the first storage device has been erased, and whether the data management unit has migrated the data in the first storage device using the data management table. A step of managing whether or not.

  The first storage device has a magnetic tape library device, and the second storage device has a disk array device.

  The data management table includes a volume number for all the volumes stored in the first storage device, a migrated flag indicating whether the volume data has been migrated to the second storage device, and the last block after the data migration. And a shifted block position indicating the position.

  When receiving a data read command from the host computer, the data migration device reads the data from the volume of the first storage device and transfers it to the host computer if the data migration of the read command has not been executed, and the second storage The step of writing the read data to the volume of the device, the step of updating the migrated block position corresponding to the volume number of the data management table, and the volume from whether the data read from the volume of the first storage device is the end To determine whether or not the data migration is complete, when the data migration is complete, when the migration flag corresponding to the volume number has been migrated, and whether data migration of all volumes from the data management table is complete Determining whether or not When data migration is complete, and having a step of erasing the data of all the volumes in the first storage in the device.

  When receiving the data write command from the host computer, the data migration device writes the data of the write command to the volume in the second storage device and the data from the migrated flag corresponding to the volume number in the second data management table. A step of determining whether or not the migration is complete, a step of setting the migration completed flag corresponding to the volume number when the data migration of the write command is not completed, and data migration of all volumes from the data management table It is characterized in that it has a step of determining whether or not it is completed and a step of erasing data of all the volumes in the first storage device when the data migration is completed.

  A data migration apparatus according to the present invention performs data migration from a first storage apparatus to a second storage apparatus with respect to a first storage apparatus and a second storage apparatus that write and read data according to instructions from a host computer. The host I / O processing means for transmitting / receiving commands and data to / from the host computer, and the write / read command data from the host computer are stored in either the first storage device or the second storage device. A data management unit that manages whether data is migrated, a data migration unit that performs data migration processing based on information in the data management unit, a unit that erases data of the first storage device that has completed data migration, and a second storage Virtualization means for performing control to virtualize the device and emulate the first storage device; Data migration completion notifying means for notifying the host computer or its own device that the data migration of the first storage device and the erasure of all the data in the first storage device have been completed. It has a data management table for managing whether or not it has been completed.

  The first storage device has a magnetic tape library device, and the second storage device has a disk array device.

  The data management table includes a volume number for all the volumes stored in the first storage device, a migrated flag indicating whether the volume data has been migrated to the second storage device, and the last block after the data migration. And a shifted block position indicating the position.

  First storage I / O issuing means for issuing I / O to the first storage device, and second storage I / O issuing means for issuing I / O to the second storage device via the virtualization means The data migration means has means for controlling the first storage I / O issuing means and the second storage I / O issuing means.

  The data management unit has a drive status table for managing the status of the drives in the first storage device in addition to the data management table. The data management table includes volume numbers for all volumes stored in the first storage device. , A migrated flag indicating whether or not the volume data has been migrated to the second storage device, a migrated block location indicating the last block location after the data migration, and data erasure of the volume in the first storage device are complete And an erased flag indicating whether or not it has been performed.

  The data management unit has a drive status table for managing the status of the drives in the first storage device in addition to the data management table. The data management table includes volume numbers for all volumes stored in the first storage device. , A migrated flag indicating whether or not the volume data has been migrated to the second storage device, a migrated block location indicating the last block location after the data migration, and data erasure of the volume in the first storage device are complete And an erased flag indicating whether or not the data has been erased, and an erased sector position indicating the sector position where data erasure of the volume has been completed.

  The drive status table has a unique drive number and a drive status indicating the usage status of the drive corresponding to the drive number.

  The storage system, the storage system data migration method, and the data migration apparatus of the present invention eliminate the trouble of erasing data without using a special computer system or hardware, and erasing data after completion of all data migration. There is an effect that can be.

  The reason is that all data migration is completed because the data migration device migrates data from the migration source storage device to the migration destination storage device in response to a write / read command, and erases the data of the migration source storage device after the data migration. This is because sometimes the data of the migration source storage apparatus is completely erased.

  Next, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  A first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic block diagram showing a first embodiment of the storage system 50, and FIG. 2 is a diagram showing a data management table 130 in FIG.

  Referring to FIG. 1, the storage system 50 includes a host computer 2, a first storage device 3 and a second storage device 4 that perform data write / read processing according to instructions from the host computer 2, and the first storage device 3. The data migration device 1 is configured to migrate data to the second storage device 4. Here, the first storage device 3 is the current data migration source, and the second storage device 4 is the data migration destination. Each of the first storage device 3 and the second storage device 4 includes a random access type drive (for example, a magnetic disk drive) that performs writing / reading processing in units of blocks.

  The data migration apparatus 1 includes a host I / O processing unit 11 that transmits and receives instructions and data to and from the host computer 2, and write / read instruction data from the host computer 2 in the first storage device 3 and the second storage. The data management unit 13 that manages the storage location of the data storage device 4, the data migration unit 12 that performs data migration processing based on the information stored in the data management unit 13, and all data migration and the first storage device 3. Data migration completion notifying means 17 for notifying the host computer 2 or its own device that all data erasure has been completed is provided. The data management unit 13 includes a data management table 130 that manages whether or not the data migration of the first storage device 3 has been completed.

  In addition, the data migration device 1 has a first storage I / O issuing unit 14 that issues an I / O to the first storage device 3 under the control of the data migration unit 12 and an I / O to the second storage device 4. And second storage I / O issuing means 15 for issuing.

  Referring to FIG. 2, the data management table 130 includes a block number 1301 and a migrated flag 1302 indicating whether or not the data of the block number 1301 has been migrated to the second storage device 4. The data management table 130 indicates that the data of the target block number 1301 has been migrated to the second storage device 4 when the migrated flag 1302 is true.

  Since the data migration device 1 erases the data in the first storage device 3 at the same time as writing the data to the second storage device 4, the fact that the data has been migrated means that the data has been erased. . Therefore, management is performed using only the migrated flag 1302 without providing an erased flag.

  The data migration completion notifying means 17 indicates that the data migration / erasure has been completed by displaying a light emitting diode (LED), sounding an alarm, sending a message via a network, or the like, the data migration device 1, the host computer 2, or not shown. Notification is made to another host computer 2.

  Next, the operation of the storage system 50 configured as described above will be described with reference to the drawings.

  FIG. 3 is a flowchart for explaining the operation when the host I / O processing means 11 receives a read command (hereinafter referred to as a READ command) from the host computer 2.

  Referring to FIG. 3, when the data migration apparatus 1 starts a read process (hereinafter referred to as “READ process”), the data migration unit 12 refers to the data management table 130, and a migrated flag 1302 corresponding to the read block number 1301. It is determined whether data has been migrated from (S101).

  If the data has been migrated, the data migration means 12 transfers the data from the second storage device 4 to the host computer 2 and ends the READ process (S107). If data migration has not been performed, data is read from the first storage device 3 and written to the second storage device 4 (S102).

  Subsequently, the data migration unit 12 erases the data of the read block of the first storage device 3 (S103).

  When the data erasure is completed, the data migration unit 12 updates the migrated flag 1302 of the corresponding block number 1301 in the data management table 130 to data migrated (S104).

  Subsequently, the data migration unit 12 refers to the data management table 130 and determines whether or not the migration of all data has been completed (S105). If the migration has not been completed, the data is transferred from the second storage device 4 to the host computer 2, and the READ process is terminated (S107).

  If the migration is complete, the data migration unit 12 notifies the completion of the migration of all data through the data migration completion notification unit 17 (S106).

  The data migration unit 12 transmits data from the second storage device 4 to the host computer 2 and ends the READ process (S107).

  Next, an operation when a write command (hereinafter referred to as a WRITE command) is received from the host computer 2 will be described with reference to the drawings.

  FIG. 4 is a flowchart for explaining the operation when the host I / O processing means 11 receives a WRITE command from the host computer 2.

  Referring to FIG. 4, when the data migration apparatus 1 starts a writing process (hereinafter referred to as “WRITE process”), the data migration unit 12 writes data to the second storage apparatus 4 (S201).

  The data migration unit 12 refers to the data management table 130 and determines whether the migrated flag 1302 corresponding to the written block number 1301 has already been migrated (S202). If the data has already been migrated, the WRITE process is terminated.

  If the data has not been migrated, the data migration means 12 erases the data of the block number 1301 on the first storage device 3 corresponding to the block number 1301 written to the second storage device 4 (S203).

  When the data erasure is completed, the data migration unit 12 updates the data management table 130 to the data migration completed flag 1302 corresponding to the erased block number 1301 (S204).

  Subsequently, the data migration unit 12 refers to the data management table 130 and determines whether or not the migration of all data has been completed (S205). If not completed, the WRITE process is terminated.

  If the migration of all data has been completed, the data migration unit 12 notifies the completion of the migration through the data migration completion notification unit 17, and ends the WRITE process (S206).

  Note that background data migration / deletion operations that are not based on commands from the host computer 2 are performed as follows.

  The data migration unit 12 refers to the data management table 130 and performs the above-described READ processing (S102) to (S106) on the block number 1301 of the unmigrated data, thereby enabling data migration / erasure.

  As described above, in the storage system 50, the data migration device 1 performs data migration from the first storage device 3 to the second storage device 4 in accordance with a write / read command, and after the data migration, Erase the data. When all data migration is completed, all data in the first storage device 3 is erased.

  Therefore, there is an effect that it is possible to eliminate the trouble of erasing data without using a special computer system or hardware and erasing data after completion of all data migration.

  Next, a second embodiment of the present invention will be described with reference to the drawings.

  FIG. 5 is a schematic block diagram showing the storage system 60 of the second embodiment, and FIG. 6 is a diagram showing the second data management table 131 in FIG.

  Referring to FIG. 5, the storage system 60 includes a host computer 2, a magnetic tape library device 7 and a disk array device 8 that perform data write / read processing in accordance with instructions from the host computer 2, and a magnetic tape library device 7 to a disk The second data migration device 5 performs data migration to the array device 8. Here, it is assumed that the magnetic tape library device 7 is the current data migration source, and the disk array device 8 is the data migration destination.

  The host computer 2 issues a WRITE command, a READ command, etc. of data to the second data migration device 5.

  The magnetic tape library device 7 includes a magnetic tape drive 74 for writing and reading data to and from a magnetic tape medium (not shown) that is a sequential access medium, a cell 71 for storing the magnetic tape medium, and a magnetic tape medium The charging / discharging cell 72 used for loading and unloading and the accessor 73 for transporting the magnetic tape medium between the cells 71 are configured. Hereinafter, the magnetic tape medium will be described as a volume, and the volume will be described as being stored in the cell 71.

  A sequential access medium is characterized in that when data is written, data after the written block becomes invalid data.

  The second data migration device 5 emulates the cell 71, the input / output cell 72, the accessor 73, the magnetic tape drive 74, and the volume constituting the magnetic tape library device 7 on the disk array device 8 as a virtual library device.

  Further, the second data migration device 5 performs data migration from the magnetic tape library device 7 to the virtual library device while performing I / O processing from the host computer 2, and the volume in the magnetic tape library device 7 in which the data migration has been completed. Erase data for.

  The disk array device 8 is configured by RAID (Redundant Arrays of Inexpensive Disks) that uses a plurality of magnetic disk drives 84 to improve reliability, and the second data migration device 5 emulates the data that emulates the virtual library device. Storing.

  Next, the configuration of the second data migration device 5 will be described in detail.

  The host I / O processing means 11 performs processing for the I / O command received from the host computer 2. When the host I / O processing unit 11 receives the READ command, the host I / O processing unit 11 requests the data migration unit 12 to transfer the data, and transfers the received request data to the host computer 2. Further, when a WRITE command is received from the host computer 2, the data is transferred to the data migration unit 12. When the positioning command is received, the data migration means 12 is processed in the same manner as the READ command, the block is advanced, and the sequential READ for each block is repeated until the target position is reached. At this time, data transfer to the host computer 2 is not performed.

  The data management unit 51 includes a second data management table 131 that manages whether or not the data of the volume in the magnetic tape library device 7 has been migrated to the volume in the virtual library device.

  Referring to FIG. 6, the second data management table 131 includes items of a volume number 1311, a migrated flag 1312, and a migrated block position 1313 for all volumes stored in the magnetic tape library device 7. .

  The volume number 1311 is associated with each volume stored in the magnetic tape library apparatus 7, and is a unique number among all stored volumes.

  The migration completed flag 1312 expresses whether or not all data migration in the volume has been completed by a truth value. If “true”, data migration has been completed, and if “false”, data migration has not been performed.

  The migrated block position 1313 indicates the last block position where data migration has been completed.

  Note that data erasure is performed immediately upon completion of data migration. Therefore, a flag for managing whether or not data has been erased is not individually provided, and the migrated flag 1312 has been data erased. Represents.

  The first storage I / O issuing means 14 performs I / O processing for the magnetic tape library device 7.

  The second storage I / O issuing unit 15 performs I / O processing on the virtualization unit 16.

  The virtualization unit 16 performs control to emulate the disk array device 8 into a virtual library device. The disk array device 8 in FIG. 5 shows an accessor 83, a cell 81, and an input / output cell 82, but these elements do not exist. The magnetic tape library device 7 is virtualized and displayed.

  Note that the method of emulating the virtual library device is not directly related to the present invention, and thus the detailed configuration is omitted.

  The data migration completion notifying means 17 notifies the completion of data migration to the outside of the second data migration device 5. After deleting the data of all the volumes in the magnetic tape library device 7, the data migration completion notifying means 17 notifies the outside by lighting an LED (not shown) indicating the completion of data migration.

  When the data migration unit 12 receives the READ command from the host I / O processing unit 11, the data migration unit 12 refers to the data management unit 51. If the data migration has not been completed, the data migration unit 12 passes the first storage I / O issue unit 14. The data is read from the magnetic tape library device 7. The data migration unit 12 transfers the read data to the host I / O processing unit 11 and transfers the data to the virtualization unit 16 via the second storage I / O issuing unit 15 to perform data migration. At this time, the data migration state is updated for the data management unit 51.

  In addition, when the data migration unit 12 receives the WRITE command from the host I / O processing unit 11, the data migration unit 12 transfers the received data to the virtualization unit 16 via the second storage I / O issuing unit 15, and performs data management. The state is updated with respect to the unit 51 as data migration is completed. In the sequential access medium, the data after the block in which the data is written becomes invalid data, so that it can be handled as having been migrated when the WRITE command processing is performed.

  Further, the data migration unit 12 erases all data in the volume in the magnetic tape library device 7 through the first storage I / O issuing unit 14 when the data migration of the entire volume is completed.

  Further, the data migration unit 12 issues a completion notification request to the data migration completion notification unit 17 when the data migration of all the volumes is completed.

  Although the configuration of the storage system 60 has been described in detail above, the host computer 2, the magnetic tape library device 7, and the disk array device 8 are well known to those skilled in the art, and a detailed description of the configuration is omitted.

  Next, the operation of the storage system 60 configured as described above will be described with reference to the drawings.

  FIG. 7 is a flowchart for explaining the operation of the READ / WRITE process of the storage system 60.

  With reference to FIG. 7, the processing of the data migration unit 12 when the host I / O processing unit 11 receives a READ command from the host computer 2 will be described first.

  The data migration unit 12 refers to the migrated flag 1312 corresponding to the volume number 1311 of the second data management table 131 in the data management unit 51 and the migrated block position 1313 to determine whether or not data migration has already been completed. Is determined (S701).

  When the data migration is completed, the data migration means 12 reads the data from the volume of the virtual library device (disk array device 8), transfers it to the host computer 2 (S703), and ends the READ command processing.

  When data migration is not completed, the data migration means 12 reads data from the volume in the magnetic tape library device 7 and transfers it to the host (S702). Further, data is written to the volume in the virtual library device, and the migrated block position 1313 corresponding to the volume number 1311 in the second data management table 131 is updated to the block position (S704).

  If the end of data is reached as a result of reading data from the volume in the magnetic tape library device 7, the data migration means 12 determines that the data migration of the volume has been completed (S705).

  When the data migration is completed, the data migration unit 12 sets the data migration flag 1312 corresponding to the volume number 1311 in the second data management table 131 to have been migrated (S706).

  Next, the data migration unit 12 determines whether the data migration of all the volumes has been completed using the second data management table 131 (S707). If there is a volume for which data migration has not been completed, the process ends.

  When the data migration of all the volumes is completed, the data migration unit 12 erases all the data written in all the volumes in the magnetic tape library device 7 (S708). The magnetic tape library device 7 can also discharge the volume to the loading / unloading cell 72 after the data erasure is completed.

  Thereafter, the data migration unit 12 turns on an LED provided on the display unit of the second data migration device 5, for example, indicating the completion of the data migration from the data migration completion notification unit 17. The data migration unit 12 disconnects the magnetic tape library device 7 from the second data migration device 5 and the process ends (S709). Although the LED is lit as a method for indicating the completion of data migration to the outside, notification such as notification to the host computer 2 or sounding an alarm may be performed.

  Next, the processing of the data migration unit 12 when the host I / O processing unit 11 receives a WRITE command from the host computer 2 will be described with reference to FIG.

  The data migration unit 12 receives the data from the host computer 2 and writes the data to the volume in the virtual library device (S710).

  It is determined whether or not data migration has been completed from the migrated flag 1312 corresponding to the volume number 1311 of the second data management table 131 (S711).

  If the data migration of the volume has already been completed, the WRITE command process ends. If the data transfer of the volume has not been completed, the process proceeds to the above-described processing (S706) and subsequent steps.

  The data migration unit 12 forces the data migration completed flag 1312 corresponding to the volume number 1311 of the second data management table 131 to be migrated (S706). This is because, in the sequential access medium, data after the block in which data is written becomes invalid data, and can be regarded as having been migrated at this point.

  The procedure after (S707) is the same as the READ command processing described above, and the description is omitted.

  As described above, the storage system 60 can perform online data migration from the migration source magnetic tape library apparatus 7 from the host computer 2. In addition, after the data migration is completed, the data written in the migration source volume is automatically erased, so that it is possible to save the trouble of erasing the data when the volume is discarded. Furthermore, if the volume is automatically ejected after erasing the data, the labor of ejecting can be saved.

  Next, a third embodiment of the storage system 60 of the present invention will be described with reference to the drawings.

  The basic structure of the third embodiment is the same as that of the second embodiment shown in FIG. 5, and the timing for erasing data written in the volume in the magnetic tape library device 7 is different from that of the second embodiment.

  The operation of the storage system 60 of the third embodiment will be described with reference to the drawings.

  FIG. 8 is a flowchart for explaining the operation of the READ / WRITE process of the storage system 60.

  Referring to FIG. 8, when the data migration unit 12 receives a READ command from the host computer 2 from the host I / O processing unit 11, whether or not the data migration has already been completed using the second data management table 131. (S801).

  When the data migration is completed, the data migration means 12 reads the data from the volume of the virtual library device (disk array device 8), transfers it to the host computer 2 (S803), and ends the READ command processing.

  If the data migration has not been completed, the data migration means 12 reads the data from the volume in the magnetic tape library device 7 and transfers it to the host computer 2 (S802).

  The data migration means 12 writes data to the volume in the virtual library device (disk array device 8), and updates the migrated block position 1313 corresponding to the volume number 1311 in the second data management table 131 to the block position ( S804).

  The data migration unit 12 determines whether the data migration of the volume has been completed (S805). If the end of the data is reached as a result of reading data from the volume in the magnetic tape library device 7, the data migration means 12 determines that the data migration of the volume has been completed.

  If the data migration is completed, the data migration completed flag 1312 is set as migrated (S806). The above (S801) to (S806) are the same as (S701) to (S706) of the second embodiment.

  After the migration flag 1312 has been migrated, the data migration unit 12 erases all data written to the volume in the magnetic tape library device 7 every time data migration of each volume is completed (S807). . This is the difference from the second embodiment.

  Thereafter, the data migration unit 12 determines whether data migration of all the volumes has been completed using the second data management table 131 (S808).

  When the data migration is completed, the data migration unit 12 turns on the LED indicating the completion of the data migration from the data migration completion notification unit 17, disconnects the magnetic tape library device 7 from the second data migration device 5, and the process is completed. (S809).

  The processing of (S810) to (S811) when the WRITE command from the host computer 2 is received from the host I / O processing means 11 is the same as the processing of (S710) to (S711) of the second embodiment described above. They are the same and will not be described.

  If the data has not been migrated in (S811), the process proceeds to the processing after (S806) in the above-described READ processing.

  As described above, the storage system 60 of the third embodiment erases data from a volume for which data migration has been completed without waiting for completion of migration of all volumes. Therefore, as compared with the second embodiment, it is possible to shorten the time from the completion of data migration of all the volumes to the separation of the migration source magnetic tape library device 7.

  The magnetic tape library device 7 may discharge the volume to the loading / unloading cell 72 after the volume data erasure is completed, or discharge the volume to the loading / unloading cell 72 after the data erasure of all the volumes is completed. You can also

  Next, a fourth embodiment of the storage system 60 of the present invention will be described with reference to the drawings.

  The basic configuration of the fourth embodiment is different from that of the second embodiment shown in FIG. 2 in that the data management unit 51 replaces the second data management table 131 (FIG. 6) and the third data management table 132 (FIG. 9). And a drive status table 134 (FIG. 10).

  Referring to FIG. 9, the third data management table 132 includes a volume number 1321, a migrated flag 1322, a migrated block position 1323, and an erased flag 1324.

  The erased flag 1324 indicates whether or not the data erasure of all the volumes in the magnetic tape library device 7 has been completed. If the erasure has not been completed, “false”, and if the erasure has been completed, “true”. And

  The volume number 1321, the migrated flag 1322, and the migrated block position 1323 are the same as the volume number 1311, the migrated flag 1312, and the migrated block position 1313 described in the second data management table 131 shown in FIG. Therefore, explanation is omitted.

  Referring to FIG. 10, the drive status table 134 includes items of a drive number 1325 and a drive status 1326 for all the magnetic tape drives 74 in the magnetic tape library apparatus 7.

  The drive number 1325 uniquely corresponds to the magnetic tape drive 74 in the magnetic tape library apparatus 7.

  A drive state 1326 indicates the state of the magnetic tape drive 74 corresponding to the drive number 1325. “FREE” when the magnetic tape drive 74 is not used, “USE” when the magnetic tape drive 74 is used for reading the source data, and the magnetic tape drive 74 is used for erasing the volume data. “ERASING” is set for each.

  In the fourth embodiment, the data migration means 12 is characterized in that the volume data is not erased during the READ / WRITE process, but is erased by the volume erase process executed in the background. The data migration means 12 is also devised in the mount / demount process (hereinafter referred to as MOUNT / DEMOUNT process) in order to efficiently use the magnetic tape drive 74 in the READ / WRITE process and the volume erase process. .

  Here, the MOUNT process means that the data migration means 12 uses the accessor 73 to move the volume from the cell 71 to the magnetic tape drive 74 before reading data from the volume that is the data migration source and erasing the data of the volume. This is a process of making the data read / erased from the volume via the magnetic tape drive 74.

  The DEMOUNT process is a process in which the data migration unit 12 uses the accessor 73 to return the volume that has been read / erased from the magnetic tape drive 74 to the cell 71.

  Next, the operation of the storage system 60 of the fourth embodiment will be described with reference to the drawings.

  FIG. 11 is a flowchart for explaining the operation of the READ / WRITE process of the storage system 60.

  Referring to FIG. 11, when the READ command is received, the data migration unit 12 uses the third data management table 132 to determine whether or not the data migration has been completed (S1101).

  If data migration has not been completed, the data migration means 12 reads data from the volume in the magnetic tape library device 7 and transfers it to the host computer 2 (S1102).

  The data migration unit 12 writes data to the volume in the virtual library device (disk array device 8), and updates the migrated block position 1323 corresponding to the volume number 1321 in the third data management table 132 to the block position ( S1104).

  The data migration unit 12 determines whether the data migration of the volume has been completed (S1105). As a result of reading data from the volume in the magnetic tape library device 7, if the end of the data has been reached, it is determined that the data migration of the volume has been completed.

  Note that the processing of (S1101) to (S1105) is the same as (S801) to (S805) of the third embodiment.

  The fourth embodiment is different from the third embodiment in that the volume is not erased even when the data migration is completed, and only the data migration completed flag 1322 is set and the READ process is terminated.

  That is, when the data migration is completed, the data migration unit 12 sets the data migration completed flag 1322 to the migration completed (S1106), and ends the READ process. If the data migration is not complete, do nothing and exit.

  Further, the processing of (S1110) to (S1111) when the WRITE command from the host computer 2 is received from the host I / O processing means 11 is the same as the processing of (S810) to (S811) of the third embodiment described above. They are the same and will not be described.

  In the above (S1111), if the data has not been migrated, the process proceeds to the processing after (S1106) of the above-described READ processing.

  As in the third embodiment, the data migration unit 12 determines whether the data has been migrated (S1111). If the data has not been migrated, the data migration flag 1322 has been forcibly migrated. (S1106).

  Next, the volume erasure process in the data migration unit 12 will be described with reference to the flowchart of FIG. 12 and FIGS.

  The volume erasure process is a process that is always executed in the background, and the data migration unit 12 first determines whether there is an erasable volume. The data migration unit 12 searches the third data management table 132 and determines whether there is an erasable volume (S1201). If the migrated flag 1322 is true and the erased flag 1324 is false, the data migration unit 12 determines that the volume is erasable.

  If there is no erasable volume, the data migration means 12 waits in the above (S1201) until any volume becomes erasable. If an erasable volume is found, the MOUNT process for the volume is performed (S1202).

  Subsequently, the data migration unit 12 performs data erasure of the volume, and after the data erasure is completed, sets the erased flag 1324 of the volume in the third data management table 132 to be true (S1203).

  DEMOUNT processing of the volume is performed (S1204). Details of the MOUNT process and the DEMOUNT process will be described later.

  The data migration unit 12 determines whether or not the data erasure of all the volumes has been completed. If there is one or more falses in the erased flag 1324 of the third data management table 132, the data migration unit 12 determines that the data migration unit 12 is incomplete and returns to (S1201). If all are true, data erasure of all the volumes has been completed, so the data migration means 12 turns on an LED indicating the completion of data migration from the data migration completion notification means 17, and the magnetic tape library device 7 is migrated to the second data. Disconnect from the device 5 (S1206).

  Next, MOUNT / DEMOUNT processing in the data migration unit 12 will be described with reference to the flowchart shown in FIG. 13 and FIGS.

  Referring to FIG. 13, when MOUNT processing for volume reading or volume erasing is started, the data migration means 12 searches the drive status table 134 for a magnetic tape drive 74 whose drive status 1326 is FREE (S1301). If there is no FREE magnetic tape drive 74, the process waits until one of the magnetic tape drives 74 enters the FREE state (S1301).

  When the FREE magnetic tape drive 74 is found, the data migration means 12 sets the drive status 1326 in the drive status table 134 to USE if MOUNT for volume read, and ERASING if MOUNT for volume erase. (S1302). The data migration means 12 uses the accessor 73 to move the volume from the cell 71 to the magnetic tape drive 74 (S1303). This completes the MOUNT process.

  Next, when the DEMOUNT process is started, the data migration means 12 performs the movement from the magnetic tape drive 74 to the cell 71 (S1311), and sets the drive status 1326 of the drive status table 134 to FREE (S1312). This is the end of the DEMOUNT process.

  As described above, in the fourth embodiment, volume data erasure processing is performed in the background of READ / WRITE processing, and a free magnetic tape drive 74 is searched when data is read / erased from the volume. Therefore, the magnetic tape drive 74 can be used efficiently, and the time required for the READ process can be shortened as compared with the third embodiment.

  Next, a fifth embodiment of the storage system 60 of the present invention will be described with reference to the drawings.

  In the storage system 60 shown in FIG. 2, the basic configuration of the fifth embodiment is that all the magnetic tape drives 74 can read sector positions and erase designated sectors. The data management unit 51 includes a fourth data management table 133 shown in FIG. 14 and a drive status table 134 shown in FIG.

  The magnetic tape drive 74 can erase a volume in units called sectors as a partial volume erasing method. The sector is a number indicating the physical position of the volume and is defined in JISX6135 Annex F.

  Referring to FIG. 14, the fourth data management table 133 includes a volume number 1331, a migrated flag 1332, a migrated block position 1333, an erased flag 1334, and an erased sector position 1335.

  The volume number 1331 to the erased flag 1334 are the same as the volume number 1321 to the erased flag 1324 of the fourth embodiment, and a description thereof will be omitted.

  The erased sector position 1335 indicates the sector position where the data erasure of the volume is completed. If all erasure is completed, “ALL” is indicated. If no erasure is completed, “−” is indicated. Management is based on the last sector number that has been erased.

  Next, the operation of the fifth embodiment of the storage system 60 will be described with reference to the drawings.

  FIG. 15 is a flowchart for explaining the operation of the volume erasing process, and FIG. 16 is a flowchart for explaining an operation obtained by further improving the MOUNT process described in the fourth embodiment.

  First, the operation of the volume erasure process will be described with reference to FIG. 15, FIG. 2, FIG. 10, and FIG.

  Referring to FIG. 15, the data migration unit 12 first determines whether there is an erasable volume. The data migration unit 12 searches the fourth data management table 133 to determine whether there is an erasable volume (S1501). If the migrated flag 1332 is true and the erased flag 1334 is false, the data migration unit 12 determines that there is an erasable volume.

  If an erasable volume is found, the MOUNT process for the volume is performed (S1502).

  Subsequently, the data migration unit 12 advances the sector position by one from the erased sector position 1335 of the fourth data management table 133 (S1503), and erases one sector (S1504).

  If there is no interruption request in the determination of whether or not there is an erasure interruption request (S1505) and the erasure of all sectors is complete (S1506), the data migration means 12 Returning to S1503), one sector is erased again.

  In the above (S1505), when the erasure interruption request is received, the erasure is interrupted and the sector position where the erasure is completed is recorded in the erased sector position 1335 of the fourth data management table 133 (S1507), and the DEMOUNT process is performed. It performs (S1508).

  In the above (S1506), if all the sectors have been erased, “ALL” is recorded in the erased sector position 1335 of the fourth data management table 133, and the erased flag 1334 of the volume is set to true. (S1507).

  When the erasure process for one volume is completed, the data migration unit 12 determines whether or not the data erasure of all the volumes has been completed (S1509). If there is one or more falses in the erased flag 1334 of the fourth data management table 133, the process returns to (S1501). If all are true, all the volumes have been erased, so the data migration unit 12 turns on the LED indicating the completion of data migration from the data migration completion notifying unit 17 and makes the magnetic tape library device 7 the second data migration unit 5. (S1510). This process is the same as (S1205) to (S1206) described in the fourth embodiment.

  Next, the operation of the MOUNT process will be described with reference to FIG.

  Referring to FIG. 16, the data migration unit 12 searches for a free magnetic tape drive 74 in the drive state 1326 (S1601). Subsequently, when the free magnetic tape drive 74 cannot be searched, it is determined whether or not the MOUNT is for reading data from the volume (S1602).

  If it is MOUNT for reading data from the volume, the data migration means 12 issues a suspend request to the magnetic tape drive 74 whose drive status 1326 is ERASING, and waits until the drive status 1326 becomes FREE (S1603). ).

  Thereafter, the data migration means 12 sets USE in the drive status 1326 of the drive status table 134 if MOUNT for data reading, and sets ERASING if MOUNT for volume erasure (S1604). Thereafter, the volume is moved from the cell 71 to the magnetic tape drive 74 (S1605).

  As described above, even in the situation where all the magnetic tape drives 74 are occupied by combining the data reading process accompanying the READ command from the host computer 2 and the volume data erasing process executed in the background, the data erasing process is not completed. It becomes possible to interrupt and interrupt the data reading process. Accordingly, it is possible to reduce the waiting time when the read processing from the magnetic tape library device 7 which is the data migration source is necessary.

1 is a schematic configuration block diagram showing a storage system of a first embodiment. It is a figure which shows the data management table in FIG. It is a flowchart for demonstrating operation | movement when a read command is received from a host computer. It is a flowchart for demonstrating operation | movement when a write command is received from a host computer. It is a schematic block diagram which shows the storage system of 2nd Example. It is a figure which shows the 2nd data management table in FIG. It is a flowchart for demonstrating operation | movement of the READ / WRITE process of the storage system of 2nd Example. It is a flowchart for demonstrating operation | movement of the READ / WRITE process of the storage system of 3rd Example. It is a figure which shows a 3rd data management table. It is a figure which shows a drive status table. It is a flowchart for demonstrating operation | movement of the READ / WRITE process of the storage system of 4th Example. It is a flowchart for demonstrating operation | movement of a volume erase process. It is a flowchart for demonstrating the operation | movement of a MOUNT / DEMOUNT process. It is a figure which shows a 4th data management table. It is a flowchart for demonstrating the operation | movement of the volume deletion process of 5th Example. It is a flowchart for demonstrating the MOUNT process operation | movement of 5th Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Data transfer apparatus 11 Host I / O processing means 12 Data transfer means 13 Data management part 14 1st storage I / O issue means 15 2nd storage I / O issue means 16 Virtualization means 17 Data transfer completion notification means 2 Host computer 3 First Storage Device 4 Second Storage Device 5 Second Data Migration Device 51 Data Management Unit 7 Magnetic Tape Library Device 71 Cell 72 Input / Output Cell 73 Accessor 74 Magnetic Tape Drive 8 Disk Array Device 81 Cell 82 Input / Output Cell 83 Accessor 84 Magnetic disk drive 50 Storage system 60 Storage system 130 Data management table 131 Second data management table 132 Third data management table 133 Fourth data management table 134 Drive status table 130 Block number 1302 Migrated flag 1311 Volume number 1312 Migrated flag 1313 Migrated block position 1321 Volume number 1322 Migrated flag 1323 Migrated block position 1324 Erased flag 1325 Drive number 1326 Drive status 1331 Volume number 1332 Migrated flag 1333 Migrated Block position 1334 Erased flag 1335 Erased sector position

Claims (37)

A host computer, a first storage device and a second storage device that write and read data according to instructions from the host computer, and a data migration device that migrates data from the first storage device to the second storage device In the storage system, the data migration device manages in which of the first storage device and the second storage device the data of the write / read command from the host computer is stored, Storage means comprising: means for managing whether or not data for which data migration of one storage device has been completed has been erased; and means for erasing data of the first storage device for which data migration has been completed system. The data migration device has a data migration completion notifying means for notifying the host computer of completion of data migration when all data migration and all data erasure of the first storage device are completed. The storage system according to claim 1. A host computer, a first storage device and a second storage device that write and read data according to instructions from the host computer, and a data migration device that migrates data from the first storage device to the second storage device In the storage system, the data migration device includes host I / O processing means for transmitting / receiving commands and data to / from the host computer, and write / read command data from the host computer to the first storage device. And the second storage device, a data management unit that manages whether the data is stored, a data migration unit that performs data migration processing based on information of the data management unit, and the first storage that has completed data migration Means for erasing device data and all data A data migration completion notifying unit for notifying the host computer or the own device that the data has been deleted and all the data in the first storage device has been erased, and the data management unit includes data stored in the first storage device. A storage system comprising a data management table for managing whether or not migration has been completed. The storage system according to claim 3, wherein the data management table includes a block number and a migration flag indicating whether or not the data of the block number has been migrated to the second storage device. 4. The storage system according to claim 3, wherein the data migration completion notifying unit includes a display unit or an alarm sounding unit. The data migration device includes: a first storage I / O issuing unit that issues an I / O to the first storage device; and a second storage I / O issuing unit that issues an I / O to the second storage device. 4. The storage system according to claim 3, wherein the data migration means includes means for controlling the first storage I / O issuing means and the second storage I / O issuing means. The storage system according to any one of claims 1 to 6, wherein both the first storage device and the second storage device have a random access type drive that performs writing and reading in units of blocks. . When the data migration device receives a data read command from the host computer, the data migration device, when the data migration of the read command is not yet executed, means for reading the data of the read command from the first storage device; 8. The method according to claim 1, further comprising: means for writing to the second storage device; and means for erasing block data read from the first storage device. The described storage system. When receiving a data write command from the host computer, the data migration device writes the data of the write command to the second storage device when the data migration of the write command is not executed, and the second storage device 8. The storage system according to claim 1, further comprising means for erasing block data of the first storage device corresponding to the block written to the disk. . A host computer, a first storage device and a second storage device that write and read data according to instructions from the host computer, and a data migration device that migrates data from the first storage device to the second storage device In the storage system, the data migration device includes host I / O processing means for transmitting / receiving commands and data to / from the host computer, and write / read command data from the host computer to the first storage device. And the second storage device, a data management unit that manages whether the data is stored, a data migration unit that performs data migration processing based on information of the data management unit, and the first storage that has completed data migration Means for erasing data of the apparatus, and the second storage Virtualizing means for virtualizing the storage device and emulating the first storage device, and the host computer or its own device that all data migration and all data erasure of the first storage device have been completed. And a data management completion notification means for notifying to the storage system, wherein the data management unit has a data management table for managing whether or not the data migration of the first storage device has been completed. 11. The storage system according to claim 10, wherein the first storage device has a magnetic tape library device, and the second storage device has a disk array device. The data management table includes a volume number for all the volumes stored in the first storage device, a migrated flag indicating whether or not the data of the volume has been migrated to the second storage device, and data migration completed 12. The storage system according to claim 10, wherein the storage system has a migrated block position indicating the last block position. The storage system according to claim 10, wherein the data migration completion notifying unit includes a display unit or an alarm sounding unit. The data migration device includes a first storage I / O issuing unit that issues I / O to the first storage device, and a second storage that issues I / O to the second storage device via the virtualization unit. 11. The I / O issuing means, wherein the data migration means has means for controlling the first storage I / O issuing means and the second storage I / O issuing means. 14. The storage system according to any one of 1 to 13. When the data migration command is received from the host computer, the data migration device reads the data from the volume of the first storage device and transfers it to the host computer when the data migration of the read command is not executed. Means for writing the read data to the volume of the second storage device, means for updating the migrated block position corresponding to the volume number in the data management table, and data read from the volume of the first storage device. Means for determining whether or not the data migration of the volume is completed based on whether it is the end, means for setting a migrated flag corresponding to the volume number when the data migration is completed, and the data management Whether data migration of all the volumes from the table is complete 15. The method according to claim 10, further comprising: means for determining whether or not data migration is complete, and erasing data of all the volumes in the first storage device when data migration is completed. Storage system. When receiving a data write command from the host computer, the data migration device writes a write command data to a volume in the second storage device, and a migrated flag corresponding to the volume number in the data management table Means for determining whether or not data migration is complete, means for setting a migrated flag corresponding to the volume number to migrated when data migration of a write command is not completed, and from the data management table, 11. The apparatus according to claim 10, further comprising: means for determining whether or not volume data migration is completed; and means for erasing data of all the volumes in the first storage device when data migration is completed. 15. The storage system according to any one of items 14 to 14. The data management unit has a drive status table for managing the status of the drives in the first storage device in addition to the data management table, and the data management table stores all the data stored in the first storage device. A volume number for the volume, a migrated flag indicating whether the data of the volume has been migrated to the second storage device, a migrated block location indicating the last block location after the data migration, and the first storage device The storage system according to claim 10 or 11, further comprising an erased flag indicating whether or not data erasure of the volume in the storage is complete. The storage system according to claim 17, wherein the drive status table has a unique drive number and a drive status indicating a usage status of the drive corresponding to the drive number. The data management unit has a drive status table for managing the status of the drives in the first storage device in addition to the data management table, and the data management table stores all the data stored in the first storage device. A volume number for the volume, a migrated flag indicating whether the data of the volume has been migrated to the second storage device, a migrated block location indicating the last block location after the data migration, and the first storage device 12. The method according to claim 10, further comprising: an erased flag indicating whether or not data erasure of the volume is completed, and an erased sector position indicating a sector position where data erasure of the volume is completed. Storage system. 20. The storage system according to claim 19, wherein the drive status table has a unique drive number and a drive status indicating a usage status of the drive corresponding to the drive number. A host computer, a first storage device and a second storage device that write and read data according to instructions from the host computer, and a data migration device that migrates data from the first storage device to the second storage device In the data migration method of the storage system, the data migration device includes a step of transmitting / receiving commands and data to / from the host computer by host I / O processing means, and data of a write / read command from the host computer Managing in which of the first storage device and the second storage device is stored by the data management unit, and performing data migration processing based on information of the data management unit by the data migration unit; , Completed the data migration A step of erasing data in one storage device, and a step of notifying the host computer or the own device by data migration completion notifying means that all data migration and all data erasure of the first storage device have been completed; And the data management unit has a step of managing whether or not data migration of the first storage device has been completed using a data management table. 22. The data migration method for a storage system according to claim 21, wherein both the first storage device and the second storage device have random access type drives that perform writing and reading in block units. The storage system according to claim 21 or 22, wherein the data management table includes a block number and a migration flag indicating whether or not the data of the block number has been migrated to the second storage device. Data migration method. When receiving a data read command from the host computer, the data migration device reads the read command data from the first storage device if the data migration of the read command is not executed, and reads the read data 24. The data migration method for a storage system according to claim 21, further comprising a step of writing to the second storage device and a step of erasing data read from the block of the first storage device. . When receiving a data write command from the host computer, the data migration device writes the data of the write command to the second storage device if the data migration of the write command is not executed, and the second storage device 24. The data migration method for a storage system according to any one of claims 21 to 23, further comprising: erasing block data of the first storage device corresponding to the block written to. A host computer, a first storage device and a second storage device that write and read data according to instructions from the host computer, and a data migration device that migrates data from the first storage device to the second storage device In the data migration method of the storage system, the data migration device includes a step of transmitting / receiving commands and data to / from the host computer by host I / O processing means, and data of a write / read command from the host computer Managing in which of the first storage device and the second storage device is stored by the data management unit, and performing data migration processing based on information of the data management unit by the data migration unit; , Completed the data migration A step of erasing data in one storage device, a step of performing control of virtualizing the second storage device by the virtualization means and emulating the first storage device, and all data migration by the data migration completion notification means. A step of notifying the host computer or its own device that all data erasure of the first storage device has been completed, and the data management unit uses the data management table to transfer data of the first storage device. A data migration method for a storage system, comprising a step of managing whether or not the data has been completed. 27. The data migration method of the storage system according to claim 26, wherein the first storage device has a magnetic tape library device, and the second storage device has a disk array device. The data management table includes a volume number for all the volumes stored in the first storage device, a migrated flag indicating whether or not the data of the volume has been migrated to the second storage device, and data migration completed 28. The data migration method for a storage system according to claim 26 or 27, further comprising: a migrated block position indicating a last block position of the storage system. When receiving a data read command from the host computer, the data migration device reads the data from the volume of the first storage device and transfers it to the host computer if the data migration of the read command has not been executed. Writing the read data to the volume of the second storage device, updating the migrated block position corresponding to the volume number of the data management table, and reading the data from the volume of the first storage device Determining whether or not the data migration of the volume is complete based on whether it is the end, setting the migrated flag corresponding to the volume number to migrated when the data migration is completed, and the data management All said volumes from the table 29. The method according to claim 26, further comprising a step of determining whether or not data migration is completed, and a step of erasing data of all the volumes in the first storage device when the data migration is completed. The data migration method for a storage system according to any one of the preceding claims. When receiving a data write command from the host computer, the data migration device writes the data of the write command to a volume in the second storage device, and a migration corresponding to the volume number in the second data management table Determining whether or not the data migration is complete from the completed flag, setting the migrated flag corresponding to the volume number to migrated when the data migration of the write command is not completed, and all from the data management table And determining whether data migration of the volume is complete, and erasing data of all the volumes in the first storage device when data migration is complete. The data migration of the storage system according to any one of items 26 to 28 Law. A data migration device for migrating data from the first storage device to the second storage device with respect to a first storage device and a second storage device that write / read data according to a command from a host computer, wherein the host Host I / O processing means for transmitting / receiving commands and data to / from a computer, and writing / reading command data from the host computer are stored in either the first storage device or the second storage device. A data management unit that manages whether or not, a data migration unit that performs data migration processing based on information in the data management unit, a unit that erases data of the first storage device that has completed data migration, and the second A virtual storage device is virtualized and controlled to emulate the first storage device. And a data migration completion notifying means for notifying the host computer or the own device that all data migration and all data erasure of the first storage device have been completed, and the data management unit includes: A data migration apparatus comprising a data management table for managing whether or not data migration of the first storage device has been completed. 32. The data migration device according to claim 31, wherein the first storage device includes a magnetic tape library device, and the second storage device includes a disk array device. The data management table includes a volume number for all the volumes stored in the first storage device, a migrated flag indicating whether or not the data of the volume has been migrated to the second storage device, and data migration completed 33. The data migration apparatus according to claim 31 or 32, further comprising: a migrated block position indicating the last block position. First storage I / O issuing means for issuing I / O to the first storage device; and second storage I / O issuing means for issuing I / O to the second storage device via the virtualization means; 33. The data migration according to claim 31 or 32, wherein the data migration means includes means for controlling the first storage I / O issue means and the second storage I / O issue means. apparatus. The data management unit has a drive status table for managing the status of the drives in the first storage device in addition to the data management table, and the data management table stores all the data stored in the first storage device. A volume number for the volume, a migrated flag indicating whether the data of the volume has been migrated to the second storage device, a migrated block location indicating the last block location after the data migration, and the first storage device 33. The data migration apparatus according to claim 31 or 32, further comprising an erased flag indicating whether or not data erasure of said volume in said is completed. The data management unit has a drive status table for managing the status of the drives in the first storage device in addition to the data management table, and the data management table stores all the data stored in the first storage device. A volume number for the volume, a migrated flag indicating whether the data of the volume has been migrated to the second storage device, a migrated block location indicating the last block location after the data migration, and the first storage device 33. An erased flag indicating whether or not data erasure of the volume in the volume is completed, and an erased sector position indicating a sector position where data erasure of the volume is completed. Data migration equipment. 37. The data migration apparatus according to claim 35, wherein the drive status table has a unique drive number and a drive status indicating a usage status of the drive corresponding to the drive number.

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