JPS63198118A - Migration processing system - Google Patents

Abstract

PURPOSE:To omit the undesirable mount and demount of a cartridge by continuously storing plural data sets on one cartridge in a range where a vacant space exists on one cartridge. CONSTITUTION:At the time of migration (shifting plural data sets which exist on a volume) in a volume unit, a Cartridge Library System (CLS) cartridge whose vacant space is the largest is selected at first and the migration of plural data sets is executed until there are no vacant spaces on the cartridge. When the vacant spaces do not exist on the cartridge, the CLS cartridge having the second largest vacant space is selected so as to demount an original cartridge and mount the selected cartridge. Thus the number of times of the mount and demount operation of the CLS cartridge can be reduced.

Description

[Detailed Description of the Invention] [Summary] When migrating data sets on a direct access volume to a secondary storage medium, multiple data sets are migrated to the extent that free space exists on one cartridge. Continuously the one cartridge 7
It is disclosed that the cartridge is configured such that it can be stored on the cartridge, thereby making it possible to omit undesired mounting and demounting of the cartridge.

[Industrial application field]

The present invention uses a cartridge of a cartridge library system as a secondary storage medium in a migration process, particularly in a migration process that automatically relocates a data set on a direct access volume onto a secondary storage medium. The present invention relates to a migration processing method that prevents undesired mounting and demounting.

A D F (Automatic Data-mig)
ration facility) is 2 direct access/
This is a subsystem that automatically saves and restores files on a volume onto a secondary storage medium. Conventional secondary storage media include MSS (Mass Storage System).
em)'s MSV (Mass StorageVo)
CLS (Ca) was used, but it seems new.
rtridge Library System) cartridges are now used as secondary storage media. The present invention is.

When a CLS cartridge is used as a secondary storage medium, processing performance is improved by changing the method for selecting a file save destination cartridge.

[Conventional technology]

Conventionally, MSS has been used as a secondary storage medium, and AD
In F, when a file is migrated (saved to a secondary storage medium), an appropriate evacuation volume is selected from a group of evacuation volumes managed by the ADF, and the file is moved. At this time.

As shown in FIG. 5, conventionally the volume with the largest free space was selected as the evacuation volume. If this method is also applied when using a CLS cartridge as a secondary storage medium, CLS.

DRD (Data Recording Divi)
Since only the number of cartridges (ce) can be mounted, it takes time to mount and demount the cartridges.

This will result in a significant performance deterioration.

FIG. 3 is an explanatory diagram when an MSV in MSS is used as an evacuation volume, and FIG. 4 is an explanatory diagram when a CLS cartridge in CLS is used as an evacuation volume.

In FIGS. 3 and 4, 1 is a direct access volume, 2 is an MSS, and 3 is a staging volume (virtual volume) in the MSS.

4 represents a CLS, and 5 represents a cartridge in the CLS.

Direct access, data on volume 1, seven nodes A and B
To relocate the data to the secondary storage ta medium, the ADF (not shown) selects the volume with the largest free space from among the evacuation destination volumes in MSS2 shown in FIG. We are currently making efforts to evacuate. However, in the case of the MSS shown in FIG. 3, a staging volume 3 is interposed between direct access volume 1 and MSS 2, and 1 direct access volume 3 is interposed between direct access volume 1 and MSS 2.
Data sets A and B on volume 1 are moved to staging volume 3.

It is stored on the MSV selected above.

For this reason, even if the evacuation volume with the most free space is selected each time an individual data set is evacuated as described above, evacuation destination volumes X and Y must be simultaneously mounted and processed. can be done, and it does not pose a big problem in terms of processing.

FIG. 4 shows a case in which the configuration shown in FIG. 3 is applied as is to the CLS. In the case shown in FIG. 4, data is directly stored from the direct access volume 1 onto the CLS cartridge 5.

[Problem that the invention seeks to solve]

In the configuration shown in Figure 4, data set A is
After storing data set B on S cartridge
When attempting to store a CLS cartridge, the CLS cartridge with the most free space at that time is selected. For this purpose, demount the CLS cartridge X shown in 9 and
The newly selected CLS cartridge Y will be mounted to store data set B.

[Means for solving problems]

The present invention solves the above-mentioned problems, and FIG. 1 shows a basic configuration diagram of the present invention.

Reference numeral 6 in the figure represents an ADF.

In the case of the present invention, the ADF 6 has (i) a function (al) to select and mount the cartridge with the largest free space when a new CLS cartridge 5 needs to be selected, and (ii) the mounted cartridge. (iii) the ability to demount the current gl cartridge and mount a new one if there is no more space (c).
1.

[Effect]

When migrating by volume (moving multiple data sets on a volume), first select the CLS cartridge with the most free space and move multiple data sets until there is no free space on the cartridge. Migrate. When there is no more empty space on the cartridge 5, the CLS cartridge with the second largest empty space is selected, the original cartridge is demounted, and the currently selected cartridge is mounted.

This method makes it possible to reduce the number of CLS cartridge mount and demount operations, and can significantly improve performance when migrating multiple files.

〔Example〕

FIG. 2 shows a flowchart of an embodiment for explaining the functions of the ADF in the present invention. Symbol (a) in the figure.

(bl, (C1) respectively correspond to the functions in the ADF shown in FIG. 1. That is, in the case of the flowchart shown in FIG. 2.

■ If a data set to be migrated exists and a cartridge is assigned, the data set is transferred as is, but the cartridge with the most free space is selected only when it is necessary to find a cartridge to transfer. This allows multiple data sets to be stored consecutively on one CLS cartridge.

〔Effect of the invention〕

As described above, according to the present invention, undesired mounting and demounting of CLS cartridges in a system using CLS is reduced.

[Brief explanation of the drawing]

Fig. 1 is a principle configuration diagram of the present invention, Fig. 2 is a flowchart of an embodiment explaining the function of the ADF in the present invention, and Fig. 3 is a flow chart of an embodiment of the present invention.
The figure shows the conventional configuration of a system using MSS, the fourth
The figure shows the conventional configuration of a system using CLS.
The figure shows the function of ADF in the conventional case. In the figure, l is a direct access volume, 4 is a CLS, and 5 is a direct access volume.
6 represents a CLS cartridge, and 6 represents an ADF.

Claims (1)

[Scope of Claims] A direct access volume (1) that can be directly accessed by a processor is provided, and a secondary storage medium for transferring and storing data sets on the direct access volume (1) is provided. 1) Automatic data migration facility (
6), the secondary storage medium is a cartridge library system (
The cartridge (5) in the direct access volume (1) is used, and the automatic data migration facility (6) is used in the direct access volume (1).
) during migration processing to relocate multiple data sets on the secondary storage medium, when selecting cartridges for the relocation, the cartridge with the most free space is selected and the cartridge is (a) to sequentially transfer and process multiple data sets until there is no more space on the mounted cartridge; and (b) when there is no more space on the mounted cartridge. It is configured to have a function (c) that demounts the cartridge and then selects and mounts the cartridge with the most free space at that time, so that multiple data sets can be consecutively placed on the same cartridge (5). A migration processing method that is characterized in that it can be stored.