JPH11272426A - Data copying/restoring system and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize effective use of the capacity of a virtual magnetic tape and high speed access, to reduce the number of magnetic tapes and to simplify maintenance/management by installing the virtual magnetic tape of a first hierarchy and the magnetic tape of a second hierarchy in magnetic tape systems so as to manage the DB of data copying/restoring. SOLUTION: A copying/restoring means 13 stores data as a backup in a magnetic tape 12 from a virtual magnetic tape 11 at the time of migration, and registers and manages the corresponding relation/state of migrated data in a copying/restoring management data base 4. At the time of restoration, data is restored in the virtual magnetic tape 11 from the magnetic tape based on the state of the copying/restoring management data base 4 and data is updated. At that time, information on the presence or absence for migration from the virtual magnetic tape 11 to the magnetic tape 12, the presence or absence of the deletion of data in the virtual magnetic tape 11 and the presence or absence of restoration from the magnetic tape 12 to the virtual magnetic tape 11 are registered in the copying/restoring management data base 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a data copying / restoring system for copying and restoring data using a magnetic tape and a recording medium.

[0002]

2. Description of the Related Art Conventionally, in the operation of a magnetic tape, the amount of data stored in the magnetic tape is often small, and the capacity of the magnetic tape, which has been increased, has not been effectively utilized. As shown in FIG. 7, the data format of the magnetic tape is composed of a plurality of data sets. Therefore, in order to effectively utilize the capacity of the magnetic tape, a plurality of / a large amount of data sets must be stored on the magnetic tape.
Changes in CL and management of the meaning of data sets and data are required, so operation changes are required. Another method is to copy the data sets of multiple magnetic tapes to one magnetic tape. However, it is necessary to manage the correspondence between the data sets of the magnetic tape of the copy source and the magnetic tape of the copy destination.

FIG. 7 shows an explanatory diagram of the prior art. FIG. 7A shows a data format in a magnetic tape. As shown in the figure, a volume label and a plurality of data sets for the backed-up data are stored in the magnetic tape as shown.

FIG. 7B shows a data set format in a magnetic tape. In this case, heading label 1, heading label 2 and a plurality of data thereof, and end label 1 and end label 2 are stored.

[0005]

For this reason, in order to effectively utilize the magnetic tape capacity, it is necessary to change existing assets and manage the correspondence between the magnetic tape and the data set.
The conventional operation is continued, and even if the capacity of the magnetic tape is increased, only one copy is used and there is a problem that it is not effectively used.

As a result, even if the magnetic tape capacity is increased, the number of magnetic tapes to be stored is increasing, and there is a problem that a large amount of mounting work for storing and restoring when necessary is generated.

[0007] The present invention solves these problems,
A first-layer virtual magnetic tape and a second-layer magnetic tape in the form of a magnetic tape are provided to manage DB of data copy / restore information, thereby realizing effective use of the capacity of the first-layer virtual magnetic tape and high-speed access. It is another object of the present invention to perform generation management of the first and second tiers of data to reduce the number of magnetic tapes in the second tier and to simplify maintenance management.

[0008]

Means for solving the problem will be described with reference to FIG. In FIG. 1, a virtual magnetic tape 11 is a virtual magnetic tape provided in a memory such as a hard disk device and recorded in a magnetic tape format.

The magnetic tape 12 is the magnetic tape 12 loaded in the magnetic tape device 5. The copy / restore management database 4 registers and manages information to be copied and restored.

The copying / restoring means 13 stores the data from the virtual magnetic tape 11 to the magnetic tape 12 at the time of migration and registers the correspondence and status of the data in the copying / restoring management database 4 or copies / restoring management database at the time of restoration. 4 to restore and update the virtual magnetic tape 11 from the magnetic tape 12 based on the state in FIG.

Next, the operation will be described. Copying / restoring means 1
Reference numeral 3 stores and backs up data from the virtual magnetic tape 11 to the magnetic tape 12 at the time of migration, and registers and manages the correspondence and state of the migrated data in the copy / restore management database 4.

The copying / restoring means 13 restores and updates data from the magnetic tape 12 to the virtual magnetic tape 11 based on the state in the copy / restoration management database 4 at the time of restoration.

At this time, the statuses include the presence or absence of migration from the virtual magnetic tape 11 to the magnetic tape 12, the presence or absence of deletion of data in the virtual magnetic tape 11, and the presence or absence of restoration from the magnetic tape 12 to the virtual magnetic tape 11. Is registered in the copy / restore management database 4.

The volume label and the data set in the virtual magnetic tape 11 are converted into a management data set in which the volume label in the magnetic tape 12 and the volume label of the copy source virtual magnetic tape 11 are set. To store multiple backups.

Accordingly, a first-layer virtual magnetic tape 11 and a second-layer magnetic tape 12 in the form of a magnetic tape are provided to copy / restore data copy / restore information in the copy / restore management database 4.
To achieve effective utilization of the capacity of the first-layer virtual magnetic tape 11 and high-speed access, and to perform generation management of the first-layer and second-layer data to perform the second-layer magnetic tape 1.
It is possible to simplify the maintenance management by reducing the number of 2.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment and operation of the present invention will be sequentially described in detail with reference to FIGS.

FIG. 1 shows a system configuration diagram of the present invention.
In FIG. 1, a magnetic tape application 1 is
It is a program that performs various processes by storing and reading data on a magnetic tape.

The magnetic disk device 2 is an external storage device accessed by the magnetic tape application 1, and stores the latest generation data here.
The virtual magnetic tape device 3 is a virtual magnetic tape 1 for reading and writing data in a magnetic tape format in a hard disk device.
The first layer is referred to as a first layer and stores -1 generation data (data of the previous generation compared to the latest generation data stored in the magnetic disk device 2). Things.

The copy / restoration management DB 4 stores a copy from the virtual magnetic tape 11 to the magnetic tape 12 and a copy of the magnetic tape 1.
This is for managing information when restoring from 2 to the virtual magnetic tape 11, and for managing information as shown in FIG. 5 to be described later.

The magnetic tape device / library device 5 is for loading a plurality of magnetic tapes 12 and backing up or restoring data.
It is called a second hierarchy and stores -2 generation data (data of the previous generation compared to -1 generation data stored in the virtual magnetic tape device 3).

The software C6 is a copy / restore means 13
The virtual / magnetic tape device 3 and the magnetic tape device / library device 5 are accessed based on the copy / restore management DB 4 to control data copy (backup) and restoration (recovery). .

The software B7 controls access to the magnetic tape device / library device 5, and the like. Next, the operation of the configuration of FIG. 1 will be described in detail according to the order shown in the flowcharts of FIGS.

FIG. 2 shows a flowchart (backup / migrate) for explaining the operation of the present invention. In FIG. 2, S1 determines whether the request is a backup request to the virtual magnetic tape 11. In the case of YES, the process proceeds to S2. If NO, the data is stored in the virtual magnetic tape device 3 from the backup source (magnetic disk) in S8.

In step S2, it is determined whether the capacity of the virtual magnetic tape device 3 is insufficient. In the case of YES, the process proceeds to S3. In the case of NO, the process proceeds to S8. In step S3, a warning message is output. Thereby, the administrator recognizes that the remaining capacity of the virtual magnetic tape device 3 has become equal to or less than the specified value.

In step S4, it is determined whether or not there is a migration instruction from the system administrator. In the case of YES, the process proceeds to S5. N
In the case of O, the process proceeds to S8. In S5, the designated number of virtual magnetic tape turns is migrated for each virtual magnetic tape, data and management information are migrated to one magnetic tape 12, and information is registered or updated in the copy / restore management DB 4 (see FIG. 4. Register or update and manage the information in FIG. 5).

In step S6, it is determined whether or not there is an instruction to delete the data of the copy source (virtual magnetic tape 11). If YES, S
7, the data of the copy source (virtual magnetic tape 11) is deleted to secure the free space of the virtual magnetic tape device, and the information in the copy / restore management DB 4 is updated (here, FIG. 4 and FIG. Is registered or updated and managed), and the process proceeds to S8. On the other hand, in the case of NO in S6, S8
Proceed to.

In S8, data is stored in the virtual magnetic tape device 3 from the backup source (magnetic disk device 2). As described above, the latest generation data in the magnetic disk device 2 is stored in the virtual magnetic tape device 3 and copied /
The management information (FIG. 5 described later) is registered and managed in the restoration management DB 3.

FIG. 3 shows a flowchart (recovery) for explaining the operation of the present invention. In FIG. 3, S11 determines whether the request is a mount request for the virtual magnetic tape 11. In the case of YES, the process proceeds to S12. If NO, the process returns to S11 and waits repeatedly.

In step S12, it is determined whether the data exists only on the magnetic tape 12. This corresponds to whether the copy / restore management table 4 has copy operation information (for example, * 1 in FIG. 4 described later) corresponding to the mount request of the virtual magnetic tape 11 in S11 (data exists on the magnetic tape). Determine. Y
In the case of ES, the process proceeds to S13. If NO, S1
Proceed to 6.

In step S13, the mounting of the virtual magnetic tape 11 is interrupted (WAIT), and the recovery process is passed by message notification (a message indicating that recovery is necessary is displayed on the screen to notify the system administrator).

In step S14, it is determined whether a recovery instruction has been issued from the system administrator. In the case of YES, the process proceeds to S15.
In the case of NO, the process proceeds to S17. S15 recovers (restores) the instructed data on the virtual magnetic tape 11 from the migration destination magnetic tape 12 to the virtual magnetic tape 11;
And the information in the copy / restore management DB 4 is updated. As a result, the data requested to be mounted is restored from the magnetic tape 12 and exists in the virtual magnetic tape 11.

In step S17, it is determined whether the system administrator has issued a forcible mount instruction. In the case of YES, the process proceeds to S18. If NO, the system waits for an instruction from the system administrator.

In step S18, the information in the copy / restore management DB is updated. As a result, the data on the virtual magnetic tape stored on the magnetic tape at the migration destination becomes old-generation data, and it is determined from the information from the copy / restore management DB that the data on the virtual magnetic tape is the latest data. Is done. This forced mount is used when the mute request to the virtual magnetic tape is a write process from the beginning and does not require data at the migration destination. This makes it possible to bypass extra restoration processing. Further, two generations of data can be stored in different hierarchies.

In step S16, the mounting of the suspended virtual magnetic tape 11 is resumed. Then, the data existing in the virtual magnetic tape 11 is transmitted to the request source. As described above, when the mount request of the virtual magnetic tape 11 is issued,
Referring to the restoration management DB 4, if the data is not present on the virtual magnetic tape 11, the data is restored from the magnetic tape 12 to the virtual magnetic tape 11 and the copy / restoration management DB 4 is updated. It is possible to transmit to.

FIG. 4 is an explanatory diagram of the present invention. here,
The upper part shows a state where the following record information shown in the figure is held for each virtual magnetic tape 11 of the first hierarchy in FIG. -First layer magnetic tape information:-Volume name:-Group name:-Hardware identifier = virtual magnetic tape device ID-Second layer (copy destination) magnetic tape information:-Volume name:-First layer virtual Data start / end position on magnetic tape-Copy operation information:-Execution system name:-Execution job name:-Execution date:-Execution time:-Initialization operation information:-Execution system name:-Execution job name:-Execution date :-Execution time:-Restoration operation information:-Execution system name:-Execution job name:-Execution date:-Execution time:-User-specific information:-Set by the user at the time of copying.

The lower part of FIG. 4 shows the meaning of the presence / absence of the copy operation information, the initialization operation information, and the restoration operation information in the upper part, respectively, as shown below on the right side. Copy operation information (* 1) Initialization operation information (* 2) Restoration operation information (* 3) Meaning Yes / No Yes (A) Yes Yes No (B) Yes No No (C) Meaning (A): No. The data of the first-layer virtual magnetic tape 11 copied in the two-layer magnetic tape 12 is
It is restored in the virtual magnetic tape of the hierarchy, and thereafter, the copy is not performed again on the second hierarchy. Therefore, the data in the first-layer virtual magnetic tape is the latest. Therefore, there is a possibility that the data in the magnetic tape of the second hierarchy is data of an old generation.

Meaning (b): Magnetic tape 12 of the second layer
The data of the first-layer virtual magnetic tape 11 copied in the first layer is the latest data, and the data in the first-layer virtual magnetic tape 11 has been deleted. Therefore, when the first-layer virtual magnetic tape 11 is used, data must be restored from the second-layer magnetic tape 12 to the first-layer virtual magnetic tape 11.

Meaning (C): Virtual magnetic tape 1 on the first level
The data in 1 is copied to the magnetic tape 12 of the second hierarchy. However, since the data in the first-layer virtual magnetic tape 11 can be used without performing restoration processing (generation operation for backup purpose), the data in the first-layer virtual magnetic tape 11 is the latest. is there. for that reason,
The data in the second-layer magnetic tape 12 may be old-generation data.

FIG. 5 shows an example of the copy / restore management DB of the present invention. This shows the specific example of FIG. 4 described above. Here, as shown in the figure, the first-layer virtual magnetic tapes a, b, and c
And one of the second-layer magnetic tapes A,
In each case, the illustrated information is set.

As described above, there are three first-level virtual magnetic tapes 11 (a, b, c), and these are
It can be stored on one magnetic tape 12. FIG.
Shows an explanatory diagram of the present invention. This shows a state in which three virtual magnetic tapes a, b, and c of the first hierarchy described in FIG. 5 are sequentially stored on one of the magnetic tapes A of the second hierarchy. That is, (1) The virtual magnetic tape a of the first hierarchy is composed of a volume label and l data sets.

(2) The virtual magnetic tape b of the first hierarchy is
It consists of a volume label and m data sets. (3) The first-layer virtual magnetic tape c is composed of a volume label and n data sets.

(4) The magnetic tape A of the second layer stores the following (4-1) to (4-3) following the volume label in order from the beginning. (4-1) The management data set including the volume label of (1) and the l data sets are stored following the volume label of the second hierarchy.

(4-2) The management data set including the volume label of (2) and the m data sets are stored after (4-1). (4-3) The management data set including the volume label of (3) and the n data sets are stored after (4-2).

As described above, the first-layer virtual magnetic tapes a, b, and c are replaced with a volume label, a management data set (first-layer virtual magnetic tape a), one data set, A management data set (first-layer virtual magnetic tape b), m data sets, a management data set (first-layer virtual magnetic tape c), and n data sets are sequentially stored. It can be stored.

[0045]

As described above, according to the present invention,
The virtual magnetic tape 11 of the first layer in the magnetic tape format and the second layer
A second level of magnetic tape 12 is provided to register and manage data copy / restore information in the copy / restore management database 4.
Since the configuration for reducing the number of the magnetic tapes 12 in the hierarchy is adopted, effective utilization of the capacity of the virtual magnetic tape 11 in the first hierarchy and high-speed access are realized, and the generation of data in the first and second layers is performed. Manage the second level magnetic tape 1
2, the maintenance management can be simplified.

[Brief description of the drawings]

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

FIG. 2 is a flowchart (backup / migrate) for explaining the operation of the present invention.

FIG. 3 is a flowchart for explaining the operation of the present invention (recovery).
It is.

FIG. 4 is an explanatory diagram of the present invention.

FIG. 5 is an example of a copy / restore management DB according to the present invention.

FIG. 6 is an explanatory diagram of the present invention.

FIG. 7 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 2: Magnetic disk device 3: Virtual magnetic tape device 4: Copy / restore management DB 5: Magnetic tape device / library device 11: Virtual magnetic tape 12: Magnetic tape 13: Copy / restore means

Claims (6)

[Claims] 1. A data copying / restoring system for copying and restoring data using a magnetic tape, comprising: a virtual magnetic tape for storing data in a magnetic tape format; a magnetic tape for storing and backing up data; A copy / restore management database for registering and managing the correspondence relationship and status between the data on the tape and the data backed up on the magnetic tape, and storing the data on the magnetic tape from the virtual magnetic tape and migrating the data during migration A copying / restoring means for registering a relationship and a state in the copying / restoring management database. 2. A data copying and restoring system for copying and restoring data using a magnetic tape, a virtual magnetic tape for storing data in a magnetic tape format, a magnetic tape for storing and backing up data, A copy / restore management database for registering and managing the correspondence and state between the data on the tape and the data backed up on the magnetic tape, and a virtual magnetic tape based on the state in the copy / restore management database at the time of restoration And a copying / restoring means for restoring and updating the data. 3. The information as to whether the migration from the virtual magnetic tape to the magnetic tape, whether to delete data in the virtual magnetic tape, and whether to restore from the magnetic tape to the virtual magnetic tape. 3. The data copying / restoring system according to claim 1, wherein 4. A volume label and a data set in the virtual magnetic tape are converted into a management data set in which a volume label in the magnetic tape and a volume label of a virtual magnetic tape to be copied are set, and the management data set is set in the magnetic tape. 2. The method according to claim 1, wherein a plurality of backups are stored.
4. A data copying / restoring system according to claim 3. 5. A means for storing data on a virtual magnetic tape in the form of a magnetic tape, a means for storing data and backing up the data on a magnetic tape, and a method for storing data in the virtual magnetic tape and data backed up in the magnetic tape. Copy the correspondence and status of
Means for registering in the restoration management database, and a program for storing the program from the virtual magnetic tape to the magnetic tape at the time of migration, and for functioning as a copy / restore means for registering the correspondence and state of data in the copy / restore management database. Computer-readable recording medium. 6. A means for storing data in a magnetic tape format on a virtual magnetic tape, means for storing data and backing up the data on a magnetic tape, data stored in the virtual magnetic tape and data backed up in the magnetic tape. Copy the correspondence and status of
Means for registering in a restoration management database, and a computer-readable recording medium recording a program for functioning as a copying / restoring means for restoring and updating a virtual magnetic tape based on the state in the copy / restore management database upon restoration .