JPS62274420A - Automatic allocating system for data set - Google Patents

Abstract

PURPOSE:To effectively use the space of a direct access volume by suppressing the generation of an extent whose use becomes difficult due to a fact that the space amount is small, to the minimum. CONSTITUTION:With regard to a selected volume, from a data set management table 3, a dummy data set name, a space amount and the number of extents are obtained as the information of a dummy data set which is allocated in said table, and when the space amount is less than the requested space amount, the allocation is shifted to the next dummy data set, and if they are equal, it is an optimum dummy data set and deleted, and a data set is allocated to its dead space. When the space amount of the dummy data set is larger than the requested space amount, the difference of its space amount is derived, compared with the case of other dummy data set, and a smaller one is selected. It is processed with respect to all dummy data sets in the volume.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] This invention relates to a memory allocation method effective for operating and managing a computer, and particularly relates to an automatic allocation method using a program. .

[Conventional technology]

In the conventional method, as described in Japanese Unexamined Patent Publication No. 60-89258, data sets of a plurality of users are arranged evenly on a direct access volume. However, no consideration was given to the effective use of space in direct access volumes.

[Problem that the invention seeks to solve]

The above conventional technology does not take into consideration the effective use of the space of the direct access volume.
There has been a problem in that the extents that are difficult to use due to the small space that occur during repeated data set allocation and data set deletion are not processed.

Therefore, an object of the present invention is to provide an automatic allocation method that can minimize the occurrence of unusable extents in a direct access volume.

[Means for solving problems]

The above purpose is to create one or more dummy data sets allocated to the free space of the direct access volume.
One or more, equal to the space of the data set you are allocating, or.

This is achieved by deleting the closest one with more space than needed and allocating the dataset to the empty space.

[Effect]

If it is possible to search for an amount of space equal to the amount of space required by combining one or more dummy data sets, the space created by the difference between the amount of space of the searched dummy data set and the amount of space required. It is possible to prevent the occurrence of extents that are small and difficult to use.

Even when there is no combination of dummy data sets that have the same space as the required space, as long as the combination has the smallest difference, the occurrence of unusable extents can be minimized.

〔Example〕

The details of the present invention will be explained below based on examples.

FIG. 1 is a configuration diagram of a system according to an embodiment of the present invention. In the processing device 1, 2 is a volume management table, which contains the volume name and its empty space as information on direct access volumes to be managed.The empty space here refers to the space of the dummy data set that exists in each volume. It is the sum of the quantities. 3 is a data set management table, which contains information on the dummy data set allocated in each volume, including the dummy data set name, the allocated volume name, the number of extents and the amount of space constituting the dummy data set. Motsu. The information in these tables is always the same as the actual state.

7 is a TSS terminal, which inputs a request for data set allocation. Volumes 4 to 6 are direct access volumes, and three are displayed as an example.

The function of automatic data set allocation is illustrated in a flow diagram in FIG. The process will be explained below according to the flow.

When there is a request to allocate a data set from the TSS terminal 7, allocate the empty space in the managed volume that is greater than or equal to the requested space in the volume management table 2.
, and perform the following processing on all volumes.

For the selected volume, obtain the dummy data set name, space amount, and number of extents as information on the dummy data set allocated therein from the data set management table 3, and compare the space amount with the required space amount. If the amount of space is less than the amount of space, move on to the next dummy data set, and if they are equal, the dummy data set is determined to be the optimal dummy data set and deleted, and the data set is allocated to the empty space. If the space amount of the dummy data set is larger than the required space amount, the difference in space amount is calculated, compared with other dummy data sets, and the smaller one is selected. This is processed for all dummy data sets in the volume. When the above-mentioned processing is completed for each dummy data set, the data set management table shows that the two dummy data sets are combined and the total number of extents does not exceed the upper limit set by the system. The same processing as in the case of one dummy data set is performed. If the processing has been completed for a combination of dummy data sets, and the optimal dummy data set or combination thereof has not been determined, only one dummy data set is required. Compare the one that is closest to the required amount of space and the one that is closest to the required amount of space that is required in the case of the combination of two dummy data sets, and then
Select the one closest to the amount of space required and determine it as the optimal dummy data set.

Deleting the determined dummy data set and allocating the required data set to the empty space.

On the other hand, in the volume management table, the empty space is changed, and in the data set management table, the dummy data set name, number of extents, and space data are changed in accordance with the above-described processing.

〔Effect of the invention〕

According to the present invention, the occurrence of extents that are difficult to use due to the small amount of space can be minimized, so that the space of the direct access volume can be used effectively.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a system according to an embodiment of the present invention, and FIG. 2 is a flow diagram of an automatic data set allocation system.

Claims (1)

[Claims] 1. Multiple linear access volumes to which dummy datasets are assigned to all empty spaces, and all tables and direct access volumes that have data set space and number of extents in the dummy data contained in these linear access volumes. In a dataset allocation system consisting of a table with the name of as data, select the combination of dummy datasets that is the closest to the space of the dataset to be allocated, and whose number of extents is within the allocatable range, and delete it. and a program for allocating the required data set to the vacant space.