JPS63214853A - Page data set maintenance processing system - Google Patents

Abstract

PURPOSE:To assure a multiplexing after the page data set is combined into a system by paging out a page located on an actual memory device by pretending to re-write the virtual memory with an instruction. CONSTITUTION:Page data sets 5-1-5-3 for a common area holding a page corresponding to a system common area on an actual memory device 1 and a space inherent area page data set holding the page corresponding to a space inherent area 1-2 are respectively multiplexed to be used. Here, first, data sets 5-3, 6-1 and 6-2 are separated by a separating function 7. In order to combine the above-mentioned data set into the system after maintenance is completed, the condition for which an individual page exists on the actual memory device 1 is obtained by a combining function 8, thereafter, a processing paging out the page on the device 1 by pretending as if the virtual memory is re-written by the instruction is executed for all data sets.

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] In a data processing system having multiplexed page data centers, an individual page data set or multiple page data sets can be processed during 24-hour continuous operation. , so to speak, it is maintained after being separated from the system1.
Next, in order to make it possible to incorporate the page into the system, we added a function to page out the page located on the real storage device by making it appear that the virtual memory has been rewritten by an instruction, and this function enables multiplexing after being incorporated into the system. It is disclosed that the company has ensured that

[Industrial Application Field] The present invention relates to a page data set maintenance processing method, particularly a page data set maintenance method that enables page data set maintenance even in a data processing system that operates continuously 24 hours a day. Regarding processing method.

[Conventional technology]

Generally, when maintenance is performed on a data set, its contents are destroyed. Therefore, when maintaining a data set, perform maintenance after creating a backup of the data center, and after the maintenance is completed. back·
The contents of the upload will be written back to the data set.

However, D
If the ASD is taken offline and I10 requests are suppressed, system operation may stop, so it may be possible to duplicate the data set and perform maintenance on one data set.

[Problem that the invention seeks to solve]

However, in the case of a system that operates 24 hours a day.

For page data sets after maintenance is complete.

Just writing back the bank up is not enough.

That is, the contents of the backup may have been updated during maintenance. Furthermore, it is not always sufficient to simply transfer the contents of the page data set of one system during operation. The absence of a given page in the set may result in data that is not completely restored in the page data set that is included after maintenance is complete.

[Means for solving problems]

The present invention solves the above-mentioned problems, and even if an area fails to be paged out when it is incorporated into a system, it can be rewritten as if the contents of virtual memory were rewritten by, for example, a CS (Compare & Swap) command. It does some tricks so that it can page out correctly.

FIG. 1 is a diagram showing the principle configuration of the present invention, in which 1 is a real storage device, 1-1 is a system common area, 1-2 is a space-specific area, 2 is a virtual space in which the system executes processing, 3 is a system common area page data set group, 4 is a space specific area page data cent group, 5-1 to 5-
3 are page data sets for the system common area,
Reference numerals 6-1 to 6-5 each represent a page data set for a space-specific area, and each small square in the figure represents a page.

Although the processor 1 is not shown, processing proceeds while accessing pages in the virtual storage space 2 shown in the drawing. During this time, needless to say, if a page fault occurs, the page data is loaded into the real storage device 1 and used.

The real storage device 1 is divided into a system common area 1-1 and a space-specific area 1-2. and.

On the system common area 1-1, for example, one page of data commonly used in the system resides. In other words, in the middle of processing, page data set 5-
There is a page on i that will not be newly saved. On the other hand, in the space specific area 1-2, data specific to each space is stored in page units. Then, it is saved onto the page data set 6-1 as necessary.

The system common area page data sets 5-1 to 5-3 are used in a multiplexed manner, and when a page in the system common area 1-1 is updated, the corresponding page data・Set 5-1 to 5-3
The page will also be updated above. Similarly, the space-specific area page data sets 6-1 to 6-5 are used in a multiplexed manner, and the pages on the space-specific area 1-2 are updated. After that, the page
The current page is also updated on data sets 6-1 to 6-5.

On the system common area 1-1 shown in the figure, there is one individual page.
A control table 9 for managing data cents is created, and corresponding to the contents of the control table 9, individual pages, data,
A disconnection function 7 for prohibiting access to sets 5-1 and/or 6-i is provided, and the control table 9
Individual page data cents 5-t corresponding to the contents of
and/or 6-1 into the system.

[Effect]

The separation function 7 performs the following processing, namely:

(i) Check whether the page data set can be detached from the system.

(ii) Set a prohibition flag on the control table 9 that manages each page data cent.

(tii) With the above control, the system operates as in the first order.

1. (Write): (al Page data set 5-1 to 5-3
and 6-1 to 6-5 are respectively divided into two groups, that is, the page data set 5-1 shown in FIG.
or divided into 5-2 groups and 5-3 groups,
Also, suppose that the page data sets are divided into a group of 6-1 to 6-3 and a group of 6-4 to 6-5,
Page data that is not detached within the same group
If a set exists, it is written to the page data set in the own group and the page data set in other groups, that is, as shown in FIG.
-2, the page data sets 6-1 and 6-2 are to be separated.
There is a page data set 6-3 in the group to which 2 belongs, and therefore 2 is not detached.
It is written to the illustrated page data set 6-3 and page data sets 6-4 to 6-5 in other groups.

(mountain) If there are no page data sets in the same group that are not detached, page data sets in other groups
Write to a data set, ie.

As shown in FIG. 1, when a page belonging to the system common area 1-1 is written, there is a page that is not to be detached in the group to which the page data set 5-3 to be detached belongs. Since the data set does not exist, it is written to page data sets 5-1 and 5-2 in other groups.

■, [Read]: When reading, only read from page data sets belonging to other groups.

The dotted line shown in FIG. 1 represents the manner in which processing is performed after separation.

Maintenance is performed on page data sets 5-3, 6-1, and 6-2 under such a state of separation, but when the maintenance is completed and they are incorporated into the system, 1 The built-in function 8 performs the following processing, namely:

tel Page data in the system common area
□ in relation to the incorporation of set 5-3.

Before separating the page data set 5-3, create a backup of the contents of the system common area page data set.

Then, after maintenance is completed on page data set 5-3, this backup is
Restore on set 5-3.

In other words, when starting up the system, page data cents 5-
Restore with the value that was paged out for 3. In addition, regarding a specific page belonging to the system common area 1-1, the page is saved from the system common area 1-1 to the page data set 5-1 or 5-2 that was in operation. Not for this reason.

It is possible to restore the data created at system startup. If it is found that there are pages that have not been restored due to page out at the time of system startup.

As shown by the solid line in FIG. 1, the virtual space 2 is made to appear to have been rewritten using, for example, a C3 instruction.

Pages in other system common areas to be paged out can be paged out from the common area 1-1. In this way, all system common area page data sets 5-1 to 5 Page out is performed at -3.

(d+ In connection with the incorporation of page data second draw 1 to 6-2 in the space-specific area -.

While pretending that the contents of virtual storage space 2 have been rewritten using, for example, a CS command, the space side is updated with space-specific area pages, data, etc. for all pages in area 1-2.
Page out is performed for set 6-1. In addition.

As for the pages belonging to the spatial unique area 1-2.

Page data sets 6-1 to 6 that were under maintenance
There are pages that have been saved to -2 and do not exist on real storage device 1, but in this case, the relevant pages can be retrieved from the page data set 6-4 or 6-5 that was under maintenance. After being read onto the real storage device 1, the above page out is performed for all page data sets 6-1 to 6-5.

〔Example〕

FIG. 2 shows an embodiment of the processing mode of the separation function shown in FIG. 1. FIG.

The right side represents processing on the O8 side, and the left side represents processing on the disconnection request side.

The requesting side checks whether or not the page data set to be detached is duplicated and checks whether detachment is possible, and sets a flag (INHIBIT) on control table 9 to the effect that "Use is prohibited by detachment request." Under this condition, the O8 side stands.

When attempting to use a page data set consisting of
Check the contents of the above 11m table 9 (■), and if it cannot be used, use another page data set (■).

On the other hand, the detachment requesting side handles the page/data to be detached.
When the previous I10 processing for the set is completed, the page data set is detached. If the data set does not exist, the volume corresponding to the page data set targeted for detachment can be placed offline.■.

FIG. 3 shows an embodiment of processing in the built-in function shown in FIG. 1. FIG. 3 is shown divided into left and right parts.

The one on the right is 03111!10? The left side represents the processing on the embedded request side.

■ The requester performs a page-in on real storage.

At this time, the O3 side does nothing if the data in the virtual space exists on the real storage device, but if the data in the temporary space does not exist on the real storage device, the page
Page in from data center to real storage ■
, On the requesting side, the detach request flag on the control table 9 that manages each page data set is turned off, and the specified page is paged out. At this time, the O8 side Page data cents that were in operation before are also subject to page out.■,
When a page out is performed, the page data
Turn on the set detachment request flag again to prevent undesired processing O0 Repeat the above process ① to 0, and when the processing for all pages is completed, turn off the detachment request flag, The installation of the page data set into the system is complete.

〔Effect of the invention〕

As explained above, according to the present invention, DASD maintenance can be performed even in a system that operates 24 hours a day,
System reliability is guaranteed.

Furthermore, even pages that were not successfully paged out at the time of system startup are paged out again, making it appear as if the virtual space has been rewritten, thereby improving the reliability of the system.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the basic configuration of the present invention, FIG. 2 shows an embodiment of processing in the separation function shown in FIG. 1, and FIG. 3 shows an embodiment of processing in the built-in function shown in FIG. In the figure, 1 is a real storage device, 2 is a virtual space, 3 is a system common area page data set group, 4' is a space private area page data cent group, and 5-1.6-i is a 7 represents the detach function, 8 represents the built-in function, and 9 represents the control table.

Claims (1)

[Scope of Claims] A processor that operates under a virtual memory system and a real storage device (1) is provided, as well as a plurality of page data sets (5-1, 6-1) in which a plurality of pages are held. The above multiple page data sets (5-1, 6-1)
is the system common area (1-) on the real storage device (1).
1) A multiplexed system common area page data set (5-
1) and the space specific area (1-) on the real storage device (1).
2) multiplexed page data set for spatially unique areas holding pages corresponding to (6-1)
In a data processing system in which the processor operates continuously for 24 hours, the individual page data sets (5-1, 6-1)
a control table (9) configured to be able to write a usage prohibition flag for the relevant page data set and a detachment request flag for the relevant page data set in accordance with the above, and a page to which the usage prohibition flag is set. - Detachment function (7) that prohibits access to the data set, and when incorporating the page data set for which maintenance has been completed into the system, individual pages exist on the above real storage device (1). After obtaining the state, the real storage device (
1) Page data set (5-3, 6-1, 6-2) whose maintenance has been completed to incorporate the above page into the above system
and non-maintenance page data sets (5-1, 5-2, 6-3, 6-4, 6- 5)
The page data set used in the data processing system that operates continuously 24 hours a day and has a function (8) to perform page out processing for both the A page data set maintenance processing method that is characterized by being able to be installed into a system after maintenance.