JPH0430244A - System file switching system for distributed system - Google Patents

Abstract

PURPOSE:To shorten the restoration time of a distributor when a system software is in trouble by exchanging the system file of the distributor in the middle of an operation in unmanned environment on the side of the distributor. CONSTITUTION:Plural IPL possible devices 113-1 to 113-i and a non-volatile IPL destination storage mechanism 121 which can be rewritten by software are given to the distributor 110. Data on a new system file 115 and an old system file 114 are given to a host computer 120. Then, only data on a difference between the new system file 115 and the old system file 114 is transferred from the host computer 120, and the distributor 110 generates the new system file in the IPL possible device which is not used from this data and data on the old system file 114. Then, the operation using the new system file is executed after subsequent IPL by altering the IPL by altering the IPL destination device stored in the distributor 110 from the host computer 120. Thus, the distributor 110-side directly generates the new system file 115 without using the old system file 114, and processing time is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for switching system files of a distributed machine from a host computer in a distributed processing system.

[Conventional technology]

The conventional method, as described in Japanese Patent Laid-Open No. 58-151663, copies the running system file from the device DK1 to the device DK2 while the system is running, and stores the current device and file in the device DK1. moreover,
After returning the rPL load path to the device DKI, the system file during operation is switched by performing IPL again.

[Problem to be solved by the invention]

The conventional method described above does not take into consideration the distributed processing system, and has the problem that it is not possible to switch the system file of the disperser during unmanned operation.

An object of the present invention is to enable system file switching of a disperser during unmanned operation.

Another object of the present invention is to obtain data for creating a new system file from a host computer and efficiently create a switching system file.

[Means to solve the problem]

In order to achieve the above objectives, the distribution machine is equipped with multiple PL-enabled devices, a non-volatile and software-rewritable IPL destination device storage mechanism, and the data of the new system file and old system file is stored in the host computer. Have it.

New system files from the host computer.

Only the differential data of the old system file is transferred, and a new system file is created in an unused IPL capable device from this data and the data of the old system file by the distribution machine. After that, if you change the IPL destination device stored in the distribution machine from the host computer, after the next IPL,
Operation will be performed using the new system file.

Transfer of data to the disperser, I from the host computer
The PL destination device is changed using the communication function of a normal distributed processing system.

[Effect]

The new system file for the distributed machine is created from the difference data sent from the host computer and the old system file data held by the distributed machine.

Resources required for data transfer can be reduced. In addition, by indicating whether the data transfer content is a difference or the entire data, if the entire new system file is transferred, the new system file can be created directly on the distribution machine side without using the old system file, reducing processing time. It becomes possible.

Since the host computer can confirm the completion of creation of a new system file and change the IPL destination device, it is possible to switch the system files of the distributed machines even if one distributed machine is unattended.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 shows the overall configuration of the distributed processing system handled in this embodiment. This system generally uses a distributed machine (one
10) a host computer (120) on which an application program is executed and performs database processing;
A communication line (130) that serves as a data transfer means between the host computer and the distributed machine, an IPL control device (111) that exists in the distributed machine and performs IPL processing, and an IPL target device storage mechanism (112) that stores the IPL target device. ), IPL capable device (113-1
) ~ (1131) 2 IPL used for IPL in this example
Enabled JA device (113-1), IPL capable device 2 (113-2) used after system file switching, external device that connects to the host and stores data of new and old system files and differential file data on the distributed machine side. Storage device (12
Consists of 1). In addition, IPL capable device 1 (113-1
) has the old system file (114), and the IPL
The capable device 2 (113-2) has a new system file (115) created from the difference data sent from the host and the old system file (114). The external storage device (121) contains an old system file (122) for the distributed machine that has the same data as the old system file (114) currently in use on the distributed machine, and a distributed system file (122) that has the same data as the old system file (114) currently in use on the distributed machine. New system file for machine (123), differential file for distributed transport with differential data created by comparing old and new system files (
124).

The contents of the data in the differential file for distributed transport (124) will be described in detail below with reference to FIG. The difference data (201,) which is the content of the difference file for distributed transport is the device name (202) that specifies the IPL capable device of the distribution machine that stores the new system file, and the data sent to the distribution machine is the new system file. Difference flag (203) indicating whether the data is the data or only the difference between the old and new system files, Data start position (204-1) indicating the start position of the data that is the difference between the old and new system files, The data that is the difference Data length (205-1) indicating the length of
It consists of data (206-1) indicating data that is a difference.

If there are i pieces of data that are different, the data start position and data length.

There are i pieces of data each.

In the following, the processing on the host computer side when switching the distributed machine system file will be described in detail with reference to FIG. First, on the host computer side, an IPL capable device to be used in the distribution machine (110) is selected (step 301). In this embodiment, it is IPL capable device 2 (113-1). Next, based on the degree of difference between the old and new system files, the distributed machine (
110) is determined (step 302).

If you want to transfer the entire new system file, set the difference flag (203) to transfer the entire file, and also set the data start position (204-1), data length (205-1), and data (206-1). Difference file for transmitting Zenshuki (124
) and then transferred to the disperser (110) (step 303). If only the difference is to be transferred, set the difference flag (203) to transfer the difference, and also set the file size (204).

and the difference data number i data start position (204-
1) to (204-i), data length (205-1) to (2
05-i), data (206-1) to (206-i)
After storing it in the difference file (124) for transmission to all the transmitters.

Transfer to the disperser (110) (step 304). Check whether the transfer has ended (step 305), and if it has ended normally, instruct the distribution machine (110) to change the IPL destination device (step 306).

In the following, the processing on the dispersion machine side when switching the dispersion machine system file will be described in detail with reference to FIG. First, disperser (1
In step 10), the IPL destination device is determined based on the data recorded in the IPL destination device storage mechanism (112) (step 401). In this embodiment, IPL capable device 1 (11
3-1). Next, the IPL control device (111)
The old system file (114) is read from L-enabled device 1 (113-1) and IPL is completed (step 40).
2). The distribution machine (110) then waits for an instruction to switch to the new system file from the host computer (120) (step 403). After receiving the switching instruction,
Based on the device name (202) in the difference data (201) sent from the host computer (120), the device that can store the new system file is determined (step 404). In this embodiment, ■PL capable device 2 (1
132). Next, according to the difference flag (203),
Deciding how to create new system files (Step 4)
05). If the entire new system file has been transferred, the data length (205-1), data (206-
A new system file (115) is created from 1) (step 406). If only the difference has been transferred, the old system file (1:14) and the old data start position (204-1) to (204-i).

A new system file (115) is created from the data length (205-1) to (205-i) and the data length (206-1) to (206-i) (step 4o7). After completing the creation of the new system file, the post computer (12
0) waits for an instruction to change the IPL destination device (step 40).
8). After receiving the instruction, the IPL destination device storage mechanism (11
2) Store the new IPL destination device (step 409
). However, operation using the new system file actually starts when one distribution machine (110) is next IPLed.

〔Effect of the invention〕

According to the present invention, since the system file of the disperser can be changed in an unattended environment and during operation, the recovery time in the event of a system software failure of the disperser is greatly shortened, and the distributed system This has the effect of improving reliability.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a distributed processing system according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of separate data held as a difference file when a system file is transferred from a host computer to a distribution machine. FIG. 3 is a detailed diagram of the processing performed on the postcomputer side when switching the distribution machine system file, and FIG. 4 is a detailed diagram of the processing performed on the distribution machine side when switching the distribution machine system file. 110 Distributor, 120...Host computer, 1
30 Communication line, 111- IPL control device, 1
12...IPL destination device storage mechanism, 113-1-IP
L-enabled device 1.114/old system file, 113
-2- IPL capable device 2.115...New system file, 121.External storage device, 122..Old system file for distributed machine, 123..New system file for distributed machine, 124.Difference file for sending all distributed machines. .

Claims (1)

[Claims] 1. In a distributed processing system consisting of a host computer and a distributed machine, the distributed machine has multiple IPL capable devices and IP
It has an L destination device storage mechanism, which allows a new system file to be built in an IPL capable device that is not in use during distribution machine operation using data transferred from the host computer.
A system file switching method for a distributed system, characterized in that it is possible to switch a system file of a distributed machine by changing an IPL destination device according to an instruction from a host computer and performing IPL again.