JPH0355636A - Automatic selection system for recovery disk - Google Patents

Abstract

PURPOSE:To enable another CPU to automatically select the recovery disk used at system down and to shorten the recovery processing time and the restarting time by storing previously the recovery disk information in a system monitor device. CONSTITUTION:When a CPU 2 has the system down, a CPU 3 decides a recovery disk based on the master recovery disk information on the CPU 2 registered in a data storage area 1a of a system monitor device 1. Thus the CPU 2 carries out a recovery operation. If the use of the master recovery disk is impossible under such conditions, the recovery disk is decided based on the information on a data storage area 1b registered as a slave recovery disk. Then a recovery operation is carried out. Thus both the recovery processing time and the restarting time can be shortened. At the same time, the use of an illegal recovery disk is prevented despite a misoperation.

Description

[Detailed description of the invention] 3. INDUSTRIAL APPLICATION FIELD [Industrial Application Field] The present invention relates to a computer system that performs recovery when restarting the system, and particularly relates to a method for automatically selecting a recovery disk from multiplexed recovery disks.

[Conventional technology]

Conventionally, this type of recovery disk selection method was based on the recovery disk usage status before the system shutdown. When the system operator specifies a recovery disk.
I selected the recovery disc.

[Problems to be Solved by the Invention] In the conventional recovery disk selection method described above, the system operator intervenes and specifies the necessary recovery disk, so the recovery startup operation takes time. An additional drawback is that it is possible to specify the wrong recovery disk.

The problem of the present invention is as follows. It is an object of the present invention to provide an automatic recovery disk selection method that can eliminate the above-mentioned drawbacks, shorten the recovery start-up operation time, and prevent erroneous selection of recovery disks.

[Means for Solving the Problems] According to the present invention, first and second CPUs and . In a system having a plurality of recovery disks accessible by each of the first and second CPUs. A system monitoring device is provided that stores recovery disk information indicating recovery disks used by each of the first and second CPUs during operation of the system,
The system went down due to a failure in one of the PUs. When restarting using the other of the first and second CPUs, the other of the first and second CPUs is used when the one of the first and second CPUs is used when the system goes down. An automatic recovery disk selection method is obtained, which is characterized in that a recovery disk that has been previously used is selected by referring to the recovery disk information.

[Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention.

The system monitoring device 1 has data storage areas 1a and 1b.
*It has lc, ld, le, and if, and is connected to CPUs (central processing units) 2, 3, and 4. Each of the recovery disks 5, 6.7, 8.9, and 10 is connected to the CPU 2.
3. and 4 are connected by a channel so that they can be accessed from each of them.

Data storage areas 1a and 1b are used to store recovery disk information of CPU2, lc and 1d are used to store recovery disk information of CPU3, and le and 1f are used to store recovery disk information of CPU4. The system monitoring device 1 is connected to a power source (for example, a battery) different from the main power source for the CPUs 2 to 4 and the recovery disks 5 to 10, and even if the main power source is turned off after the system goes down,
The memory contents of the system monitoring device 1 are preserved.

When the CPU 2 uses the recovery disk 5 as a mask recovery disk and the recovery disk 6 as a slave recovery disk, and the CPU 3 uses the recovery disk 7 as a master recovery disk and the recovery disk 8 as a slave recovery disk. C.P.
U2 stores recovery disk information indicating the recovery disk 5 as the master recovery disk of the CPU 2 in the data storage area 1a, and stores recovery disk information indicating the recovery disk 6 as the slave recovery disk of the CPU 2 in the data storage area 1b. . Similarly, CP
U3 stores recovery disk information indicating the recovery disk 7 as the master recovery disk of the CPU 3 in the data storage area lcl-, and stores recovery disk information indicating the recovery disk 8 as the slave recovery disk of the CPU 3 in the data storage area 1d. Store.

If CPU2 goes down due to some kind of failure, C
When restarting using the PU 3, the CPU 3 selects a recovery disk based on the contents of the data storage areas 1a and 1b that store the recovery disk information of the CPU 2 in the system monitoring device 1, and performs recovery startup of the system. At this time, the CPU 3 determines the recovery disk based on the information of the data storage area 1a registered as the master recovery disk and performs recovery, but if the master recovery disk cannot be used due to some failure, it is registered as the slave recovery disk. A recovery disk is determined based on the information of the data storage area 1b, and recovery is performed.

[Effects of the Invention] As explained above, the present invention stores recovery disk information indicating the recovery disk used by the first CPU during system operation in the system monitoring device, so that the first CPU The second CPU can automatically select the recovery disk that was being used when the system went down based on the recovery disk information, reducing recovery processing time and restart time. This has the effect of preventing recovery due to unauthorized recovery disks caused by erroneous operations.

Margin below

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a system that implements the automatic recovery disk selection method according to the present invention. 1 is a system monitoring device, la to 1f are data storage areas,
2, 3, and 4 are CPUs, and 5 to 10 are recovery disks. Figure 1 5 6 7 8 9 10

Claims (1)

[Claims] 1. First and second CPUs; and the first and second CPUs.
in a system having a plurality of recovery disks accessible by each of the first and second CPUs, a system monitor for storing recovery disk information indicating a recovery disk being used by each of the first and second CPUs during operation of the system; If one of the first and second CPUs goes down due to a failure, the first and second CPUs
When rebooting using the other one of the first and second CPUs, the other one of the first and second CPUs saves the recovery disk that the one of the first and second CPUs was using at the time of the system down. An automatic recovery disk selection method characterized in that a recovery disk is selected by referring to recovery disk information.