JPH07200401A - Auxiliary storage capacity dynamic change method - Google Patents

Abstract

(57) [Summary] [Purpose] The capacity of the auxiliary storage data set in use which is arranged on the external storage device can be dynamically changed without stopping the system. [Structure] When the capacity of a designated auxiliary storage data set A5 is increased, access is prohibited by a flag that temporarily prohibits access to a data set management table provided in the main memory 2, and Incremental processing is performed on the data set A5. Further, when the capacity of the auxiliary storage data set A5 is reduced, it is determined whether or not there is a free capacity enough to be transferred to the auxiliary storage data set B7, and if there is, in the management table of the auxiliary storage data set B7. Incremental processing of. After completing these processes,
The flag is accessible. As a result, the capacity of the auxiliary storage data set can be dynamically changed without stopping the computer system, the auxiliary storage is in shortage while the computer system is in use, and resources such as an external storage device in which the auxiliary storage is arranged are allocated. It is possible to prevent waste of data and operate the system efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dynamically changing auxiliary storage capacity, and more particularly to a method for dynamically changing auxiliary storage capacity by an auxiliary storage data set arranged on an external storage device.

[0002]

2. Description of the Related Art Auxiliary storage is essential in considering the concept of virtual storage. Generally, the auxiliary storage is arranged on the magnetic disk device or the expansion storage device, and the auxiliary storage of a size necessary for the operation of the system is pre-allocated. The virtual memory is usually configured by being divided into real memory and auxiliary memory. Only the frequently used ones are stored in the real memory, and the other ones are stored in the auxiliary memory as less frequently used. The probability of being

In the processing system having the virtual memory as described above, when the real memory capacity that can be used as the virtual memory is small, when a large amount of jobs are sent, unnecessary items in the real memory are expelled to the auxiliary memory. When the capacity of the auxiliary storage is small, the auxiliary storage capacity is insufficient when the job is executed, which causes a problem that the job cannot be executed. In order to eliminate such a problem, a necessary auxiliary storage size is calculated in advance to allocate a sufficient auxiliary storage capacity. However, this method causes a problem that the resources of the external storage device to which the auxiliary storage is allocated are wasted when the auxiliary storage is used infrequently, for example, when a small number of jobs are sent.

For this reason, it is necessary to dynamically change the size of the auxiliary storage according to the size of the job and to operate the system efficiently. Currently known methods for changing the size of auxiliary storage require reallocation of auxiliary storage and restarting of the system, which has a problem that it takes time and effort. .

As a conventional technique which can solve the above-mentioned problems and dynamically change the size of the auxiliary storage without stopping the system, for example, "Hitachi HITAC Manual, System Operation-JSS3" can be used. The technique described as "PAGEADD command" on page 203 of the volume is known.

This prior art is to increase the number of auxiliary storage data sets themselves as a means for reducing the load on the auxiliary storage data sets. That is,
According to this conventional technique, when the command uses the already allocated auxiliary storage data set in the system, the allocated auxiliary storage data set is input during system operation, and the auxiliary storage data is set. The set can be used as an auxiliary memory.

However, this prior art method cannot delete the auxiliary storage data set.
The number of auxiliary storage data sets once incremented cannot be decreased during system operation.

[0008]

In the above-mentioned prior art, it is necessary to previously allocate the auxiliary storage data set,
Further, since the number of auxiliary storage data sets is increased, there is a problem that management of the data sets in the system becomes complicated.

The object of the present invention is to solve the above-mentioned problems of the prior art, and to make it possible to dynamically change the capacity of the auxiliary storage data set itself which is already used, without stopping the system, This ensures that when the load is high,
When the auxiliary storage data set has a large capacity and a small amount of jobs are executed, that is, when the load is low, the auxiliary storage data set has a small capacity so that the system can continue processing due to lack of auxiliary storage capacity. It is to provide a method of dynamically changing the auxiliary storage capacity, which can prevent the system from becoming unavailable and prevent the waste of resources to operate the system efficiently.

[0010]

According to the present invention, the above-mentioned object is to provide means for externally instructing an instruction to dynamically change the capacity of the auxiliary storage data set, and read / write to the auxiliary storage data set, that is, a page. The auxiliary storage data set management table for managing each of the plurality of auxiliary storage data sets, and the auxiliary storage data set management table includes a plurality of auxiliary storage data sets. It is composed of a plurality of area management tables that manage each of the divided areas and a usage status management table that manages the usage status of these area management tables. The area management table is used as another auxiliary storage data set management table. This is achieved by changing the capacity of the auxiliary storage data set on the external storage by the transfer.

[0011]

According to the present invention, the system is capable of automatically changing the auxiliary storage capacity and is capable of easily issuing a change instruction from the outside, so that complicated environment setting can be performed. The capacity of the auxiliary storage can be changed dynamically, more efficiently. Further, according to the present invention, since the access to the data set for auxiliary storage is controlled to be temporarily stopped, it is possible to easily recreate the management table of the operating system.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a dynamic storage capacity changing system according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a computer system to which the present invention is applied, FIG. 2 is a diagram for explaining the configuration of a management table for auxiliary storage data sets, and FIG.
4 is a flow chart for explaining the process for changing the auxiliary storage capacity, FIG. 4 is a flow chart for explaining the process for changing the contents of the auxiliary storage management table, and FIG. 5 is a system for automatically recognizing the size of the auxiliary storage. It is a flow chart explaining processing which changes memory to a suitable size. 1 and 2, 1 is a central processing unit, 2 is a main storage device, 3 is an external storage device group, 4 is an external storage device A, 5 is an auxiliary storage data set A, 6 is an external storage device B, 7 Is an auxiliary storage data set B, 8 is an operating system, 20 is a main table for managing the entire auxiliary storage data set, 21 is a data set A management table, 22 is a data set B management table, and 23 is a usage status. A management table, 24 is a classification management table, and 25 is a write prohibition flag.

An embodiment of a computer system to which the present invention is applied is, as shown in FIG. 1, an external storage that constitutes a central processing unit 1, a main storage unit 2, an external storage unit group 3, and an external storage unit group 3. Devices A4 and B6 and their external storage A4 and B6
It is composed of auxiliary storage data sets A5 and B7 arranged above and used in the computer system, and an operating system 8 for controlling these. An auxiliary storage data set management table (not shown in FIG. 1) is provided on the main storage device 2. Creation of this management table and updating of data are controlled by the operating system 8.

The management table is, as shown in FIG.
A main table 20 for managing the entire auxiliary storage data sets A5, B7 arranged on the external storage devices A4, B6;
It is composed of a management table 21 of the auxiliary storage data set A5 and a management table 22 of the auxiliary storage data set B7. The main table 20 points to the management tables 21 and 22 of each auxiliary storage data set.
Then, the management table 21 of the auxiliary storage data set,
The information about the auxiliary storage, such as the names of the external storage devices A and B and the capacity of the auxiliary storage, is stored in 22.

These auxiliary storage data set management tables 21 and 22 are divided into a usage status management table 23 for managing the usage status of the auxiliary storage and an auxiliary storage in a certain unit (for example, 1 cyl, 1 MB unit). If the table 24 for managing what is in the divided area is used, the table 24 for managing what is in the auxiliary storage area for each unit is used. Table 24 is pointed to from table 23.

Next, in one embodiment of the present invention configured as described above, the processing operation for dynamically changing the auxiliary storage capacity by command input from the outside will be described with reference to the flow shown in FIG. .

(1) First, the command input from the outside is analyzed, the syntax of the operand is checked, and as a result, it is determined whether or not there is an error. If there is an error, an error message is output and the command processing ends (steps 31, 32).

(2) If the check in step 32 is normal, it is searched whether or not the specified auxiliary storage data set name exists, and as a result, if the specified data set does not exist, an error message is displayed. The output is finished and the processing of the command is completed (steps 33 and 34).

(3) If the designated data set exists in the check in step 34 and it is for auxiliary storage, the validity of the designated capacity is checked in step 35. That is, it is determined whether the designated capacity is a value equal to or larger than the capacity of the external storage device, and whether the designated capacity is less than the auxiliary storage capacity required by the system (steps 350 and 351).

(4) If the specified capacity is greater than or equal to the capacity of the external storage device in the validity check of the specified capacity in step 35, or if the specified capacity is necessary for the system. If the storage capacity is less than the specified storage capacity, an error message is output indicating that the specified capacity is invalid, command processing is terminated, and if the specified capacity other than the above is normal, the auxiliary storage data set management shown in FIG. The write inhibit flag 25 in the table 21 is turned on (step 36).

The operating system has a flag 25.
By turning on, the access to the auxiliary storage data set is stopped, and while the access is stopped,
The configuration of the auxiliary storage data set management table 21 is changed so as to correspond to the designated capacity.

(5) To change the auxiliary storage capacity, first,
It is checked whether the current capacity is larger than the designated capacity (step 37).

(6) If the current capacity is smaller than the specified capacity in the check in step 37, that is, if the capacity is larger than the current capacity, the management table is changed and the write-inhibit flag 25 is turned off. The command processing ends (steps 39 and 3A).

(7) If the current capacity is larger than the designated capacity in the check in step 37, that is, if the capacity is made smaller than the current capacity, the data set area is released and that portion is used for other auxiliary storage data. Need to move to set. Therefore, it is determined whether or not there is a sufficient capacity, that is, a free area in the other auxiliary storage data set (step 38).

(8) If the other auxiliary storage data set does not have a sufficient free space in the check in step 38, an error message is output because there is no auxiliary storage data set to which the data set area to be released is transferred. Then, the write prohibition flag 25 is turned off (reset) and the command processing is ended (step 3A).

(9) If it is checked in step 38 that the other auxiliary storage data set has a sufficient free space, the management table change processing is performed, the write prohibition flag 25 is turned off (reset), and the command processing is ended. (Steps 39 and 3A).

Next, the procedure for changing the auxiliary storage management table in step 39 will be described with reference to FIG.

(1) First, it is judged whether the designated capacity is larger or smaller than the current capacity (step 4).
0).

(2) If it is determined in step 40 that the designated capacity is larger than the current capacity, the bitmap table itself pointed to by the management table is enlarged by the table expansion processing corresponding to the designated data set. (Step 41).

(3) If it is determined in step 40 that the designated capacity is smaller than the current capacity, the table corresponding to the area to be released is released in order to make the auxiliary storage smaller than the current capacity. Then, the processing for transferring the released area to another auxiliary storage data set management table is performed. It should be noted that, when entering this processing, it is known from the processing of step 38 that there is a free area in the other auxiliary storage data set (step 42).

The above-mentioned processing will be described with reference to FIG. 2. If the auxiliary storage data set A is desired to be small, is there a difference in capacity between the current auxiliary storage capacity and the auxiliary storage data set B? If there is, it is to perform the incremental processing of the auxiliary storage data set B. As a result, the extra capacity of the auxiliary storage A is transferred from the auxiliary storage A to the auxiliary storage B.

Next, the processing operation when the system automatically changes the capacity of the auxiliary storage will be described with reference to the flow shown in FIG.

(1) The system constantly monitors the usage status of the main table 20 of the auxiliary storage management table, and whether the auxiliary storage capacity is insufficient in the system, that is, whether the auxiliary storage is full or not. (Step 5
0).

(2) If it is determined in step 50 that the auxiliary memory is insufficient, the management table is expanded. This processing can be performed by the same processing as the processing steps 36, 39 and 3A of FIG. 3 described above (step 51).

(3) If the auxiliary storage is not insufficient in step 50, it is determined whether or not the auxiliary storage has a margin based on the usage status of the management table (step 52).

(4) Step 52, when the system determines that the auxiliary storage has a margin, a process of releasing an unused area is performed. This processing can be performed by the same processing as the processing steps 36, 38 and 39 of FIG. 3 described above (step 53).

The automatic capacity change of the auxiliary storage by the system by the processing shown in FIG. 5 can be performed by the system monitoring the state of the auxiliary storage at regular intervals and executing this processing.

Although the above-described embodiment of the present invention has been described as having two sets of auxiliary storage data sets, the present invention can be applied to a system having a larger number of auxiliary storage data sets. it can.

[0040]

As described above, according to the present invention, it is possible to dynamically change the capacity of a data set for auxiliary storage without stopping the computer system. It is possible to prevent unusable useless use of resources such as an external storage device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a computer system showing an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a management table of an auxiliary storage data set.

FIG. 3 is a flowchart illustrating a process of changing an auxiliary storage capacity.

FIG. 4 is a flowchart illustrating a process of changing the contents of an auxiliary storage management table.

FIG. 5 is a flowchart illustrating a process in which the system automatically recognizes the size of the auxiliary storage and changes the auxiliary storage to an appropriate size.

[Explanation of symbols]

1 Central Processing Unit 2 Main Storage Device 3 External Storage Device Group 4 External Storage Device A 5 Auxiliary Storage Data Set A 6 External Storage Device B 7 Auxiliary Storage Data Set B 8 Operating System 20 Managing Auxiliary Storage Data Set Main table 21 Auxiliary storage data set A management table 22 Auxiliary storage data set B management table 23 Usage management table 24 Classification management table

Claims (2)

[Claims] 1. A dynamic change method of auxiliary storage capacity in a computer system configured by arranging a plurality of auxiliary storage data sets on an external storage device, wherein each of the plurality of auxiliary storage data sets is managed. An auxiliary storage data set management table is provided, and the auxiliary storage data set management table manages each of the areas obtained by dividing the auxiliary storage data set into a plurality of areas, and the use of these area management tables. And a usage status management table for managing the status. By moving the area management table to another auxiliary storage data set management table, the capacity of the auxiliary storage data set on the external storage is changed. A method of dynamically changing the auxiliary storage capacity. 2. The dynamic change of the auxiliary storage capacity according to claim 1, wherein the change of the capacity of the auxiliary storage data set is performed by an instruction from a computer system or by an external command. method.