JPH06274404A - Data storage managing method - Google Patents

Abstract

PURPOSE:To store a large quantity of data in a small number of external storage medium by checking a retention term of generated data, at the time of saving its data in the external storage medium, and saving it in the external storage medium in which the data being near the time when its retention term expires is stored. CONSTITUTION:In the data saved in a seved data file 6, the data whose data of storage term is near at hand is saved in the same file, and at the time of saving, in the case the samed data quantity is small, and there is room for the capacity of a saving origin data file 3, the data is not saved until the data quantity concerned reaches the prescribed capacity. In such a state, in the data saved in the saved data file 6, a date of the most faraway retention term is set to a retention term data of its file, and at the time of saving the data, a generation date of the data, a retention term of the data, and correspondence to the saved data file 6 are registered in a retention management file 4, and by referring to this storage management file 4, saving and recovery are executed automatically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer system for creating a plurality of data having various retention periods in a direct access storage device at any time and saving the corresponding data in an external storage medium such as a magnetic tape. The present invention relates to a data storage management method.

[0002]

2. Description of the Related Art Conventionally, as a typical example of a computer system that creates a plurality of data having various storage periods in a direct access storage device at any time, there is a system such as a calculation center that creates various form data by each business program.

The form data created by such a system is characterized by being created every day. Also,
These data are temporarily placed in the direct access storage device for immediate output, but cannot be placed in the direct access storage device during the period until the data retention period expires due to the large amount.

Therefore, a conventional method is to save and store the data in an external storage medium such as a magnetic tape, recover the saved data as needed, and reuse the data.

As a typical saving method of this data, there is a method of saving the files in which the data is stored on a file-by-file basis every day in a batch. A known example of this method is "VO
S3 / ES High Speed DASD Copy Dump DCDP2
E2 Hitachi, Ltd. ”.

However, in this method, since data is saved in file units, even if only a part of the files is saved, it must be recovered in file units, and unnecessary data is also recovered. Will end up.

Further, if unnecessary data is recovered, there arises a disadvantage that the data created on the same day on the direct access storage device must be temporarily disabled.

In order to avoid this inconvenience, there is also a method of selecting the data to be stored, not the file, but the data existing in the file and selecting the data or the group of the data to store. As a publicly known example of this method, "Comprehensive operation management system HOPSS3
Hitachi ”.

[0009]

However, in the method of saving data in units of data or in groups of data, recovery can only be performed in units of saved data, and the correspondence between saved data and external storage media must be managed manually. There is a problem that it must be.

Further, if the data is saved in the external storage medium without considering the expiration date of the plurality of data to be saved,
If one form data in the external storage medium has a very long storage period, the external storage medium cannot be used for other purposes until the storage date of the form is reached, making the external storage medium unnecessary. The problem is that we have to prepare a lot.

Considering a magnetic tape, which is a typical external storage medium, when a plurality of data is divided into groups, a daily external storage medium for saving is required for each group. Therefore, if there are many groups, there is a problem that a large amount of external storage media must be prepared.

An object of the present invention is to provide a data storage management method capable of storing a large amount of data in a small external storage medium.

[0013]

In order to achieve the above object, the present invention basically provides a direct access storage device with a computer system that creates a plurality of data with various retention periods as needed. When the data is saved to the external storage medium, the retention time of the data is checked, and the data is saved to the external storage medium that stores the data close to the expiration date.

[0014]

According to the above-described means, the data to be stored is saved in the same external storage medium as the data whose storage deadline is close.

As a result, the number of external storage media for storing data is greatly reduced.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings.

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

In FIG. 1, 1 is a data storage management system program, 2 is a business job, 3 is a save source data file (a direct access storage device) for storing data created by the business job 2, and 4 is information necessary for storage management. A storage management file 5 for storing is a display device for the user to instruct data to be saved / recovered.

Reference numeral 6 is a save data file (external storage medium) for storing save data, 7 is a list of external storage media whose retention period has expired, 8 is a list of saved data names, and 9 is a list of recovered data names.

FIG. 2 is a functional block diagram for saving data.

In FIG. 2, 10 is a data extraction process for saving, 11 is a data name list table, 12 is an external storage medium selection process for saving, 13 is an external storage medium selection reference table, 14 is data saving process, and 15 is related. This is a form output process.

FIG. 3 is a functional block diagram for data recovery.

In FIG. 3, reference numeral 16 is a recovery target data extraction process, and 17 is a data recovery process.

FIG. 4 is a configuration diagram of the data name list table 11 stored in the storage management file 4, in which items of the data name 18, the storage period 19, the external storage medium name 20, and the direct access storage medium name 21 are held. ing.

FIG. 5 is a block diagram of the external storage medium selection reference table 13 stored in the storage management file 4.
Items such as a data storage time limit range 22, a storage class 23, a save process execution reference data amount 24, and a used external storage medium name 25 are held.

A case of saving data in the above configuration will be described with reference to FIG.

First, when one or more data names of data to be saved are designated via the display device 5, the save target data extraction process 10 selects the data name of the data name from the data name list table 11 in the save management file 4. Related information (data name 18, retention period 19, external storage medium name 20
And the direct access storage medium name 21) are extracted.

Next, the save external storage medium selection process 12
Compares the retention time limit 19 of the save target data with the retention time limit range 22 of the external storage medium selection reference table 13 in the retention management file 4, and determines the retention class 23 and the data file 6 of the retention destination.

That is, as for the data to be saved in the save data file 6, the save class 23 and the save destination data file 6 are determined so that the data whose save dates are close to each other are saved in the same file.

Further, the external storage medium selection reference table 1
3, the save process execution reference data amount 24 of the save class 23 is acquired, and if the save data amount of this time is larger than the save process execution reference data amount 24, the data save process 14 is performed. The data saving process 14 is repeated next time without performing.

That is, when the amount of data to be saved in the save data file 6 is small and the save source data file 3 has a sufficient capacity, the save data file 6 is saved until the amount of data to be saved reaches a certain amount. Do not evacuate,
Save in save source data file 3.

Then, the related form output process 15 outputs the external storage medium name list 7 whose storage period has expired and the data name list 8 saved this time.

Next, the case of recovering data will be described with reference to FIG.
Will be described with reference to.

In FIG. 3, first, the display device 5
When a single data or a plurality of data to be recovered is designated via, the recovery target data extraction process 16 selects the relevant information (data name 18, storage time limit 19, external data) from the data name list table 11 in the storage management file 4. The storage medium name 20 and the direct access storage medium name 21) are extracted.

Next, based on the related information, the data recovery processing 17 recovers the corresponding data from the saved data file 6 onto the saved source data file (direct access storage medium) 3.

After that, the related form output processing 15 outputs the data name list 9 recovered this time.

In this way, when the data saving process is performed, the relevant information of the relevant data is searched from the data name list table 11 using the data name 18 as a key, and then the relevant information and the direct access storage medium name 21 are searched. The external storage medium name 20 of the save destination is determined, and the save processing is automatically performed by the data save management system program 1.

In the case of performing data recovery processing, the related information of the corresponding data is searched from the data name list table 11 with the data name 18 as a key, and then the related information and the name of the external storage medium of the save destination are searched. The direct access storage device name 21 is determined from 20, and the recovery processing is automatically performed by the data storage management system program 1.

In order to automatically perform the data saving / recovering process as described above, only in the initial stage,
It goes without saying that the data name table 11 and the external storage medium selection reference table 13 are created in the storage management file 4.

As described above, in the present embodiment, among the data to be saved in the save data file 6, the data whose expiration dates are close to each other are saved in the same file. When the amount of saved data is small and the save source data file 3 has a sufficient capacity, the save is not performed until the amount of data reaches a certain amount. Then, the farthest retention date of the data saved in the save data file 6 is set as the retention date of the file, and when the data is saved, the creation date of the data, the data expiration date, and the correspondence with the saved data file 6 Is registered in the storage management file 4, and the storage management file 4 is referenced to automatically save and restore.

Therefore, the saved data file 6 storing the data whose storage period has expired is quickly released, and the data whose storage period is close to each other are saved in the same file. The amount used can be significantly reduced.

Further, the recovery can be easily performed only by specifying the data name, without performing the work of manually checking the management book.

Therefore, if it is applied to the operation of a computing center or the like that creates a large amount of data with different storage deadlines, it will be extremely effective in terms of the cost and storage space of an external storage medium such as a magnetic tape.

[0044]

As described above, according to the present invention, in a computer system that creates a plurality of data with various retention periods in a direct access storage device as needed, when saving the created data to an external storage medium, Since the data retention period is checked and the data is saved to the external storage medium that stores the data close to the expiration date, a large amount of data can be stored in the small external storage medium.

Therefore, if it is applied to the operation of a calculation center or the like that creates a large amount of data with various storage deadlines, it will be extremely effective in terms of the cost and storage space of an external storage medium such as a magnetic tape.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an embodiment to which the present invention is applied.

FIG. 2 is a functional configuration diagram at the time of saving data according to the embodiment.

FIG. 3 is a functional configuration diagram at the time of data recovery of the embodiment.

FIG. 4 is a configuration diagram of a management book held on a data name list table according to the embodiment.

FIG. 5 is a configuration diagram of a management book held on an external storage medium selection reference table according to the embodiment.

[Explanation of symbols]

1 ... Data save management system program, 2 ... Business job, 3 ... Save source data file, 4 ... Save management file, 5 ... Display device, 6 ... Save destination data file (external storage medium), 7 ... Save expired external storage medium List, 8 ... Saved data name list, 9 ... Recovery data name list, 10 ... Save target data extraction process, 11 ... Data name list table, 12 ... Save external storage medium selection process, 13
... external storage medium selection reference table, 14 ... data saving processing, 15 ... related form output processing, 16 ... recovery target data extraction processing, 17 ... data recovery processing, 18 ... data name, 1
9 ... Retention date, 20 ... External storage medium name, 21 ... Direct access storage device name, 22 ... Retention period range, 23 ... Retention class, 24 ... Retention process execution reference data amount, 25 ... External storage medium name used.

Claims (3)

[Claims] 1. In a computer system for creating a plurality of data having various retention periods in a direct access storage device at any time, when the created data is saved to an external storage medium,
A data storage management method, characterized in that the storage time limit of the data is checked, and the data is saved to an external storage medium that stores data close to the expiration date. 2. When the amount of data to be saved is small and the direct access storage device of the save source has a sufficient capacity,
The data storage management method according to claim 1, wherein the data is not saved in the external storage medium until the amount of data to be saved reaches a predetermined amount. 3. The storage expiration date of the external storage medium is the storage expiration date of the data having the furthest expiration date among the data saved in the external storage medium, and when saving the data to the external storage medium. Register the data creation date, retention date, and correspondence with the external storage medium in the storage management file, and select the save destination external storage medium and the recovery external storage medium by referring to the storage management file. The data storage management method according to claim 1, wherein