JPH01307856A - Data processing system - Google Patents

Abstract

PURPOSE:To perform the initial program load (IPL) processing through an effective access bus by adding a valid bit setting and holding part and a valid bit reset part. CONSTITUTION:When an operator requests the IPL processing, a V bit setting and holding part 32 in a service processor 3 discriminates whether all V bits are reset or not. If any V bit is set, the holding part 32 reports the set V bit to an IPL indicating part 31. A central processing unit 2 performs the IFL processing in accordance with the indication of the indicating part 31. When the IPL processing is not normally terminated, a reset reporting part 21 regards the access, which is executed through an access bus 51 as the access bus indicated by the indicating part 31, as invalid. A V bit reset part 33 resets the V bit corresponding to the bus 51.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention has a dual system resident volume,
An access path that is duplicated for each system-resident volume, an initial program load instruction section (hereinafter referred to as IPL instruction section) that instructs initial program load (hereinafter referred to as IPL), and an access path instructed by the IPL instruction section. Access the system resident volume via the access path,
The present invention relates to a data processing system having a central processing unit that performs initial program load processing (hereinafter referred to as IPL processing). [Prior Art] FIG. 3 is a block diagram showing a conventional example of this type of data processing system. The data processing system 1a includes a central processing unit 2a and an IP
It is composed of a service processor 3a having an L instruction section 31, a duplicated magnetic disk device 11.12, and a disk control device 41.42. The magnetic disk device 11 is connected to a disk controller 41 via an access path 51 and to a disk controller 42 via an access path 53. The magnetic disk device 12 is connected to the disk controller 41 via an access path 52 and to the disk controller 42 via an access path 54. Equivalent system resident volumes are mounted on the magnetic disk devices 11 and 12. The central processing unit 2a is connected to disk controllers 41 and 42. An IPL instruction section 31 provided in the service processor 3a provides information and instructions necessary for performing IPL processing to the central processing unit 2a. Next, IPL processing of this data processing system 1a will be explained. The operator uses the IP provided in the service processor 3a.
When the IPL processing is requested by operating the L button (not shown), the IPL instruction section 31 is activated. Started I
The PL instruction unit 31 selects the access path 5 from a path designation button (not shown) provided on the service processor 3a.
Read which one of 1.52.53.54 is specified. Here, for example, if the access path 51 is specified, the central processing unit 2a is instructed to access the system resident volume of the magnetic disk device 11 connected via the access path 51. The central processing unit 2a accesses the system resident volume of the magnetic disk device 11 via the disk control device 41 and the access path 51 according to instructions from the IPL instruction section 31, and
Perform PL processing. [Problems to be Solved by the Invention] In the conventional data processing system described above, for example, when there is a failure in the access path 51, the access path 51 must be repaired or the operator must operate the path designation button of the service processor 3a. The disadvantage is that the central processing unit 2a cannot access the system resident volume of the magnetic disk device 11 and perform IPL processing unless the access path designation is changed. [Means for Solving the Problems] The data processing system of the present invention disables the access made via the access path instructed by the initial program load instruction section when the instructed initial program load is not completed normally. and a reset notification unit that deems the access to be invalid, and when the reset notification unit does not consider the access invalid, sets a valid bit corresponding to each access path that is not considered invalid, and the initial program load instruction unit sets the access path to the valid bit. a valid bit setting holding unit that selects one of the access paths for which a valid bit is set and causes the initial program load instruction unit to instruct the selected access path; The device includes a valid bit reset unit that causes the valid bit setting holding unit to reset a valid bit corresponding to the access path used for the access deemed invalid when the reset notification unit deems the access invalid. [Operation] If the access made via each access path is not considered invalid, a valid bit indicating that the access path is valid is set, and IPL processing is performed via the access path for which the valid bit is set. When the access via each access path is deemed invalid, the valid bit is reset, so as long as there are no faults in all access paths, the access path cannot be repaired, and the access path cannot be repaired by operator operation. IPL can be performed via a valid access path without changing the access path designation. [Example 1 Next, an example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the data processing system of the present invention, and FIG. 2 is a flowchart showing the operation of this embodiment. The data processing system 1 includes a central processing unit 2, an IPL instruction section upper effective bit setting holding section (hereinafter referred to as the V bit setting holding section) 32, and a valid bit reset section (hereinafter referred to as the v Viratricerate section) 33. The service processor 3 includes a service processor 3, a magnetic disk device 11.12, and a disk control device 41.42. Magnetic disk device 11.12, disk control device 41.
42, access path 51.52.53.54 and IP
L-instruction section 1 is the same as that used in the conventional example shown in FIG. 3. The central processing unit 2 is connected to disk controllers 41, 42. Further, the central processing unit 2 includes a reset notification unit 21 that considers the access made via the access path instructed by the IPL instruction instruction unit to be invalid if the IPL does not end normally. ■The bit setting holding unit 32 stores the access paths 51, 52.
When access to the magnetic disk device 11.12 by the central processing unit 2 via the 53.54 is considered valid, a valid bit called "Valid bit" (
(hereinafter referred to as V bit) is the access path 51.52.53
．． 54 respectively, and the set and set V bits are notified on the IPL instruction instruction section. V bit habit 98
The unit 33 causes the v bit setting holding unit 32 to reset the v bit corresponding to the access path deemed invalid by the reset notification unit 21 when the IPL processing does not end normally. Note that all the V bits are set in advance by the operator at the time of system generation. Next, IPL processing of this data processing system 1 will be explained. IPL installed in the service processor 3 by the operator
When IPL processing is requested by operating a button (not shown) (step 101), the V bit setting holding unit 32
determines whether all V bits have been reset (step 102). If all V bits have been reset, the V bit setting holding unit 32 passes control to an error handling program (not shown) and performs IPL processing. ends. If even one V bit is set, the V bit setting holding unit 32 transfers the set V bit to the IP address.
The L instruction instruction section is notified, and the IPL instruction instruction section is thereby activated (step 103). Here, for example, if the V bit corresponding to the access path 51 is set, I
The PL instruction instruction unit instructs the central processing unit 2 to access the system resident volume of the magnetic disk device 11 connected via the upper 1 access path 51. The central processing unit 2 accesses the system resident volume of the magnetic disk device 11 according to the instructions from the IPL instruction section 1 and performs the IPL process. Based on the notification from the IPL instruction section upper 1 central processing unit 2, it is determined whether the IPL' processing has ended normally (step 104). If the IPL processing has ended normally, the IPL instruction instruction section upper 1 operating system ( (not shown), and the IPL processing ends. If the IPL processing does not end normally, access path 5, which is the access path shown in IPL instruction section 1
The reset notification unit 21 considers the access made via the access path 1 to be invalid (step 105), and the V bit habit 98 unit 33 resets the V bit corresponding to the access path 51 (step 106), returns to step 102, and performs the above-mentioned process. Repeat.

【Effect of the invention】

As explained above, the present invention sets a valid bit indicating that the access path is valid when the access made via each access path is not considered invalid,
IPL via access path with valid bit set
When the access through each access path is deemed invalid, the operator can repair the access path by resetting the valid bit, as long as all access paths are intact. This operation has the effect of allowing you to select a valid access path and perform IPL without changing the access path designation, and as a result, system downtime due to inability to perform IPL can be reduced. effective.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the data processing system of the present invention, FIG. 2 is a flowchart showing the operation of this embodiment, and FIG. 3 is a block diagram showing a conventional example of the data processing system. DESCRIPTION OF SYMBOLS 1... Data processing system, 2... Central processing unit, 3... Service processor, 11.12... Magnetic disk device, 21... Reset notification section, 31... IPL instruction section, 32 . . . V bit setting holding section, 33 . . . V bit setting holding unit, 33 .

Claims (1)

[Claims] 1. A system resident volume that is duplicated, an access path that is duplicated for each system resident volume, an initial program load instruction section that instructs an initial program load, and an initial program In a data processing system that includes a central processing unit that accesses a system resident volume via an access path specified by a load instruction unit and performs initial program load processing, the specified initial program load did not complete normally. In this case, the reset notification unit deems the access made via the access path instructed by the initial program load instruction unit as invalid, and if the reset notification unit does not consider the access invalid, each access that is not considered invalid. A valid bit is set corresponding to the access path, and when the initial program load instruction section instructs the access path, selects and selects one of the access paths for which the valid bit is set. a valid bit setting holding unit that causes the initial program load instruction unit to instruct the initial program load instruction unit to specify the access path that has been accessed; a valid bit reset unit that causes the valid bit setting holding unit to reset the valid bit setting holding unit.