JPH1011344A - Data backup method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To frequently backup and preserve a file with multiple updating times to protect it by providing a step for referring to access times in a prescribed period and a step for backup-holding a file system where the access times are more than a fixed value at a set time. SOLUTION: A backup controller 11 reads a backup managing file 16 and a setting file 14 and, then, reads information of a disk access information table 15. The backup controller 11 compares the setting files 14 with data of the disk access information table 15, specifies the area with the high updating frequency, executes incorporation at the beginning of a backup schedule and shortens the backup interval of a backup object file system with multiple updating times. Then, the schedule where the area with the lower updating frequency is delayed in the backup schedule is set and applying data in an object disk device 12 is preserved in a tape device 13 at every setting file 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method of storing backup data between a memory device and a backup device in a computer system.

[0002]

2. Description of the Related Art In a conventional data storage method, data storage is performed in a specified order on all targets specified by a specified schedule. FIG. 4 is a diagram showing a configuration of an apparatus for performing a conventional method and an example of file information.
In the figure, 31 is a backup control device, 32 is a disk device which is a memory of a system to be used for backup, and 33 is a tape for backup. Reference numeral 34 denotes a backup setting file referred to by the backup control device.

The operation of the backup system having the above configuration is as follows. The backup control device 31 that saves the data follows the setting file 34 in the order described in the setting file 34 / usr, / etc, / com.
The data of the disk device 32 to be backed up is read out in the order of mon and stored in the tape device 33. FIG.
2 is a flowchart showing the flow of the operation of the device having the above configuration. That is, when a predetermined backup time is reached in step 41, the setting file 34 is referred to in step 42,
In step 43, the required target file is stored in the tape device 33. By the way, there is known an incremental backup method for backing up only a changed portion based on previously stored information in order to save data in a short time. However, even in this method, it is necessary to scan the entire file system to be backed up to find out where to back up. In the database, a backup range is specified based on disk update information managed by the database itself.

As described above, in the ordinary data storage method, the data of all the volumes to be backed up is stored at a specified time, and especially the area which is frequently updated and which requires frequent data storage is updated. Areas that need to be backed up infrequently and at intervals are also backed up at the same time, so the time required for one backup is long.
Further, when a system failure occurs, there is a high probability that data that has not been backed up at that time will be lost in an area with a high update frequency. Even in an area where the update frequency is low, it is necessary to check the update status of the file every time in order to check the updated file. In a database system, the database itself manages the update information of the disk, so it is possible to back up necessary parts.However, for data that is updated by general applications other than the database, the disk managed by the operating system Update information exists, but this information is not used for backup.

[0005]

Since the conventional data backup method is performed as described above, the time required for backup is long, there is necessarily a backup interval, and the possibility of data erasure is high. There was a problem of becoming. Furthermore, since the backup is always performed at the designated time, there is a problem that the backup is performed even when the system is under a heavy load in a sudden operation, which hinders the smooth execution of the business system.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to obtain a more efficient data backup method by referring to memory access information and changing a backup interval according to the number of accesses and priority. With the goal.

[0007]

According to the present invention, there is provided a data storage system comprising:
The backup method includes an access information table that records the number of accesses for each file system to be backed up, and refers to the number of accesses in a predetermined period. Selecting and backing up a file system.

Further, the number of times of access is the number of times of writing to the memory, and a file written more than a certain number of times in a predetermined period is backed up.

Further, a plurality of levels of backup write time are set, and backup storage is performed in a combination of these levels and the number of times of access.

[0010] Furthermore, backup priorities are set in the file system, and backup storage is performed using a combination of these priorities and the number of accesses.

[0011] Further, a column for recording the number of accesses relating to the business is provided, and when the number of accesses relating to the business during the set period decreases, backup storage is started.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a diagram showing a configuration of an apparatus for obtaining a data backup method according to the present invention. In the figure, 11 is a backup control device, 12 is a disk device which is a memory of a system to be backed up, and 13 is a tape for backup. Reference numeral 14 denotes a conventional setting file, and reference numeral 15 denotes a disk access information table for recording access information to a newly provided memory. In this case, the number of times of reading and the number of times of writing for each file as a unit to be backed up for each predetermined period When,
The backup priority is recorded. Reference numeral 16 denotes a backup management file that records the operation of the backup control device 11.

The operation concept of the data backup method by the above-configured device is as follows. The backup control device 11 reads the backup management file 16 and the setting file 14. Next, the information in the disk access information table 15 is read. The backup control device 11 compares the data in the setting file 14 and the data in the disk access information table 15, specifies an area with a high update frequency, and incorporates the area into the beginning of the backup schedule. A backup schedule is delayed for an area with a low update frequency, and a schedule is set so that no backup is performed for an area where no update is performed. For each setting file 14, the corresponding data in the target disk device 12 is stored in a tape. It is stored in the device 13.

The data storage method configured as described above will be described as a specific operation according to the flowchart shown in FIG. When the set backup time comes, in step 201, the backup control device 11 reads the backup management file 16. Step 202
Next, the setting file 14 is read. In step 203, information of the disk access information table 15 after the last backup time recorded in the backup management file 16 is further obtained from the operating system. In step 204, the information in the disk access information table 15 is read. Step 2
At 05, the backup target file system set in the setting file 14 is compared with the information in the disk access information table 15. In step 206,
File systems for which the number of times of writing is 0 are excluded from the target because backup is unnecessary. In FIG. 1, / co
Since the number of times of writing is 0, / common
From the backup target.

In step 207, the setting file 1
The backup target file system set in step 4 and the information in the disk access information table 15 are compared and arranged in descending order of the number of times of writing. In FIG. 1, / et
c, / usr. In step 208, it is checked whether the backup execution date set in the setting file 14 is every day. When the backup is performed every day, the process proceeds to step 209; otherwise, the process proceeds to step 211. In step 209, for example, in the case of the lower 50% of the backup target file systems arranged in ascending order, the process proceeds to step 210, and in the case of the upper 50%, the process proceeds to step 213. In step 210, if the previous backup has not been performed, the process proceeds to step 213. If the backup has been completed, the backup is excluded from the backup target. On the other hand, step 21
In 1, even if it is not every day, if the day is a backup execution day, the process proceeds to step 213. If not, the process proceeds to step 212. Step 21
In 2, in the case of the upper 50% of the backup target file systems arranged in ascending order, the process proceeds to Step 213, and in the case of the lower 50%, the file system is excluded from the backup target. In step 213, the backup control device 11 saves data from the disk device 12 to the tape device 13.

As described above, when performing a backup, the backup interval of the file system to be backed up that is frequently updated is shortened based on the disk access information managed by the operating system. The amount is minimized.
On the other hand, since the backup interval of the file system to be backed up with a small number of updates is lengthened, unnecessary backup processing can be reduced. Also, since the backup target file system that has not been updated is not backed up, unnecessary backup processing is eliminated.

In the above embodiment, whether or not to back up is determined by the number of times of writing a file in a backup unit in a predetermined period. This may be the number of times of access including the number of times of reading. Step 2
In step 09 and step 212, whether or not backup can be executed at that time is determined only by the number of writes.
Priority is specified for each file in the access information table, and this priority is added to the ascending order list.
Higher priority ones may be included in the top 50%. Of course, other distribution methods may be used.

Embodiment 2 FIG. FIG. 3 is a flowchart showing processing of another data backup method according to the present invention. The operation of the data backup method according to the present embodiment will be described below. That is, data storage is performed when the frequency of disk access at the time of backup execution is low, and data storage is postponed when the frequency is high.
The disk access information in this case can be considered as the number of memory accesses in the target business system. First, as a specific operation, in step 51, disk access information for each hour in the past 24 hours is acquired. If the disk access count in the immediately preceding hour is less than the previous disk access count in step 52, step 55
If there are many, go to step 53. In step 53,
Pause for example after one hour. In step 54, the disk access information for the last hour is acquired, and the process returns to step 52. At step 55, data backup is performed.

In the above description, the backup schedule is set with reference to the disk access information. However, the backup may be performed at a time when the number of processes is small with reference to the process execution status. Further, the disk access information is recorded in file system units, but may be implemented in file units.

[0020]

As described above, according to the present invention, there is provided an access information table for recording the number of accesses to the file system, the step of referring to the number of accesses in a predetermined period, and the step in which the number of accesses exceeds a predetermined value at a set time. Since the step of backing up and saving the file system is provided, there is an effect that the frequently updated files are frequently backed up and protected.

Further, since the backup is stored in a combination of the backup time and the priority, there is an effect that the file is efficiently protected according to the priority.

Furthermore, when the number of accesses to the memory for business operations decreases, backup storage is started, so that there is an effect that backup can be performed without hindering business execution.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an apparatus for obtaining a backup method according to the present invention.

FIG. 2 is a flowchart illustrating an example of a processing procedure of a backup method according to the present invention;

FIG. 3 is a flowchart illustrating a procedure of a backup method according to another embodiment of the present invention;

FIG. 4 is a diagram showing a configuration of a conventional backup device and an example of file information.

FIG. 5 is a flowchart illustrating a procedure of a process performed by a conventional backup device.

[Explanation of symbols]

11 backup control unit, 12 disk unit, 1
3 tape device for backup, 14 setting files,
15 Disk access information table, 16 Backup management file.

Claims (5)

[Claims] 1. An access information table for recording the number of accesses for each file system to be backed up, the step of referring to the number of accesses in a predetermined period; Selecting a file system having a value greater than or equal to the value and backing up the data. 2. The data backup method according to claim 1, wherein the number of times of access is the number of times of writing to the memory, and a file written over a certain number of times in a predetermined period is backed up. 3. The data backup method according to claim 1, wherein a plurality of levels of backup write time are set, and backup storage is performed in a combination of the level and the number of accesses. 4. The data backup method according to claim 1, wherein a backup priority is set in the file system, and the backup is stored in a combination of the priority and the access count. 5. The data backup method according to claim 1, further comprising the step of providing a column for recording the number of accesses relating to a task, and starting backup backup when the number of accesses relating to the task during a set period decreases.