JPH0418660A - Method for restoring communication information between processors - Google Patents

Abstract

PURPOSE:To improve the reliability of a system as a whole by holding communication information while duplexing it for an address control processor SCP and a communicated party processor, and restoring communication address information without using the function of the SCP. CONSTITUTION:An operator inputs a communication recovery address REV command to a processor 4 with a communication address erasing processor ID(ID=02) as a parameter. In an REV command processing, it is investigated whether or not the designated processor ID exists in an address control table 9 of the processor itself, and when it exists, the communication address of the processor itself is announced through a loop to the other processor. Based on the processor ID and the communication address transmitted from the processor 4, a processor 3 restores the address information and afterwards, communication between the processors 3 and 4 is started again.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides a multi-purpose computer system in which a plurality of processors are connected via a communication path such as an optical loop, in which communication information is lost due to a processor going down. The present invention relates to a processing method for restoring communication information necessary for restarting communication after communication has been completed.

[Prior art 1] Conventionally, in a compound computer system consisting of a group of processors in which a plurality of processors are connected using a communication path such as an optical loop, a logical communication identification r (hereinafter referred to as , Processor II) and the communication path are centrally managed by a dedicated or specific processor (hereinafter referred to as address management processor), and the communication addresses are managed according to requests from each processor. A method was used to notify each processor of information. In inter-processor communication,
The processor ID and communication address of the communication partner processor are held as transmission address information and used for data transmission and reception. If one of these processors goes down and the transmission address information is lost, the transmission address information can be obtained again by inquiring the address management processor when restarting.

In addition, as this type of conventional literature, rloOMb/
s Inter-processor coupling system using optical token ring J Journal of the Information Processing Society of Japan, Vol. 27° No. 4. (1
986), co-authored by Satoko, Koyanagi, and Uozumi.

[Problems to be Solved by the Invention] In the conventional method, communication address information is centralized in the address management processor, so if the address management processor stops service due to a failure etc., the communication of the communication partner processor is Since address information could not be obtained, communication processing could not be started at any time.

In addition, if the service of the address management processor stops after receiving notification of the communication address from the address management processor, communication can be continued at that point, but after that, if the communication processor goes down etc. When information is lost, it is necessary to re-inquire about the other party's communication address, making it impossible to restart the communication process.

For this reason, in systems that require high reliability, methods such as duplication of specific processors for managing address information have been taken. However, this will increase the cost of the system.

An object of the present invention is to solve such conventional problems, and even when communication address information held by a communication processor is lost, it can be restored and communication can be resumed without contacting the management processor, thereby improving reliability. An object of the present invention is to provide a method for restoring inter-processor communication information that can reduce the cost of a system without lowering the cost of the system.

[Means to solve the problem]

In order to achieve the above object, in the inter-processor communication information restoration method of the present invention, a predetermined specific processor receives correspondence information between a processor ID used for designating all communication processors and a communication address of the processor on a communication path. Each other processor communicates with the communication partner processor by holding the communication partner processor ID and communication address information notified from the specific processor, and communicates with the communication partner processor ID held by its own processor. If the address information is lost, an inquiry is made to the specific processor for the above information, but if the inquiry fails, a notification command is sent to the communication partner processor, so that the communication partner processors can mutually exchange the communication address information. It is characterized by notifying each other and restoring information.

[For production]

In the present invention, communication address information is made to exist in both processors during communication, so that even if information of one processor disappears, corresponding information exists in the other processor. Receive the retained communication address information and restore the lost address information. Thereby, the communication address information can be easily restored without inquiring the address management processor about the communication address information again.

〔Example] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a compound computer system showing one embodiment of the present invention.

In FIG. 1, 1 is a high-speed loop communication path forming a ring shape, and 2 is an address management processor (hereinafter referred to as S) that centrally manages the communication addresses of each processor connected in the loop.
3 to 6 are a group of processors connected in a loop, 7 is an adapter that connects each processor in a loop, 8 is address information managed by 5CP2, and 9 is a communication address table newly provided in the present invention. It is.

In the present invention, each processor 3 to 6 maintains a communication address table 9 that stores processor ID and communication address pairs, so even if one processor goes down and loses communication address information, the other processor The communication address information can be restored using the contents of the table 9 held.

FIG. 2 is a diagram showing the contents of address information managed by the SCP in FIG. 1.

The address information @8 held by the address management processor 2 is a table as shown in FIG. recorded. Here, processors 2 and 4 are assigned numbers with the same processor ID and communication address values, and the other processors 3, 5, and 6 are assigned numbers with different values.

FIG. 3 is a frame format diagram of communication data transmitted and received via the loop communication path of FIG. 1.

The frame used here includes a delimiter (D), a destination communication address (1)A), and a source communication address (SA).
, loop command (LC), communication information (I), frame check sequence (Fe2), and delimiter (D)
It consists of

FIG. 4 is a flowchart of communication address inquiry processing to the SCP.

When a request for communication with another processor connected via the loop occurs, each of the processors 2 to 6 inquires the communication address of the other processor to the 5CP2.

It is now assumed that a communication request to processor 4 (ID=03) has occurred in processor 3 (ID=02) (step 41). Since the processor 3 does not have the communication address information of the other processor 4, the SC
The communication address of the other processor is inquired of P (step 42). At this time, taking advantage of the fact that the only processor that manages addresses is S, (j)2, the global communication address (D A = FF is used as the global address) is specified as the destination address,
5 Sends an inquiry frame to CP2. here,
RPC is a communication address request subcommand. 501
) 2, the global address is the destination address (D
If the frame specified in A) is received, it is determined that the frame is addressed to the user. In response to this inquiry, 5CP2
checks the communication address corresponding to the designated processor ID from the address information it manages, and first sends the request to processor 4 (ID=03), which is the target of the communication address inquiry, to processor r D (I D
=02) and communication address (04) Step 4
3), Processor 4 is sent to Processor 3 which made the next request.
(processor ID=03) communication address (03
) (step 44). For each processor, 5
The processor ID and communication address pair notified from CP2 is held in the communication address table 9 and used for communication between the processors (step 45).

Next, a method for restoring the communication address information that is the contents of the communication address table 9 will be explained. After the communication address information is notified from 5CP2 to each processor by the procedure shown in Fig. 4, if the communication address information is lost due to a processor down etc., conventionally, the communication address information is sent to 5CP2 again by the procedure shown in Fig. 4. It was necessary to inquire about the communication address of the other processor. Therefore, when S Cl]2 went down, it was impossible to restore communication information.

In the present invention, it is possible to restore communication address information even when SCI) 2 is out of service.

FIG. 5 is a flowchart of communication address information restoration processing according to the present invention.

Now, assume that the communication address information is lost while the processor 3 is communicating with the processor 4 (step 51). When the processor 3 recovers (step 52) and a communication request with the processor 4 occurs again (step 53), the 5CP
If the processor 2 is in service, the communication address of the processor 4 is inquired according to the procedure shown in FIG. 4 (step 5).
,4. ．． 55). However, if S Cl) 2 is unable to acquire the communication address information due to service outage, etc., the operator will receive a message from Processor 4 (ID=
03), the communication address recovery command (hereinafter referred to as R
(denoted as EV command) (Step 56)
). The operator uses the communication address loss processor I 1
) (T I) = 02) as a parameter, input the ■ command to the processor 4 in 1-< (step 57)
. In REV command processing, the own processor (ID=0
3), the specified processor ID (
ID=02) exists (step 58).
, if it exists, it notifies the processor (ID=02) of its own communication address via a loop (steps 59 and 61). In the processor 3, the SC in FIG.
Similarly to the notification from P, address information is restored based on the processor ID and communication address sent from processor 4 (step 62), and thereafter communication between processors 3 and 4 is resumed (step 63).

In addition, in the embodiment, when address information cannot be obtained from 5CP2, a method is explained in which a message is output to request the operator to input a REV command to the other processor. Against RE
By inputting the RE V command and sending the RE V command to all processors communicating with the third processor using the communication interface, it is also possible to collectively restore the address information held before the communication address information was lost. It is possible.

In this way, in this embodiment, even if the communication address held by the communication processor disappears when the communication address was previously acquired from the SCI, the communication address information can be retrieved from the communication address information on the other processor side. It is possible to restore and resume communication.

[Effects of the Invention] As explained above, according to the present invention, communication information is
I) and the other processor are duplicated and held, so
Communication address information can be restored without using the functions of 5CI), thereby improving the reliability of the entire system and reducing system costs.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a compound computer system showing an embodiment of the present invention, FIG. 2 is a diagram showing communication address information of the address management processor in FIG. 1, and FIG. 3 is a diagram showing the communication address information of the address management processor in FIG. FIG. 4 is a format diagram of a pig frame to be transmitted and received, FIG. 4 is a flowchart of address information inquiry processing 1 to the SCP in FIG. 1, and FIG. 5 is a flowchart of address information restoration processing of a misfiring QIJ. ]: Loop-shaped high-speed communication path, 2-near address management processor (SCP), 3 to 6: Processor group, 7: Adapter that connects each processor to the loop, s: Address information managed by SCP, 9: Each processor Communication address table to maintain. Figure ■ Figure SCP Processor 4 DA SA LCI C8 5PC: Communication address transmission subcommand 02: Processor ID 04 = Communication address SCP □ Processor 3 Processor 3 ° Processor 4 W: Data transmission subcommand Figure

Claims (1)

[Claims] (1) In an inter-processor communication system in which multiple processors are connected to a ring-shaped or bus-shaped closed communication path and mutually transmit and receive data, a predetermined specific processor is designated as all communication processors. By holding correspondence information between the processor ID used for the process and the communication address on the communication path of the processor, and each other processor holding the ID and communication address information of the communication partner processor notified from the specific processor, When communication is performed with a communication partner processor and the above-mentioned partner processor ID and communication address information held by the own processor are lost, an inquiry is made to the above-mentioned specific processor for the above information, but if the inquiry fails, the communication partner processor By inputting a notification command to the processor I of the communication partner processor,
Extract the lost communication address information from D and the communication address,
A method for restoring communication information between processors, characterized in that the information is restored by notifying the lost processor.