JP2010152781A - Backup server device, backup/restore program, and backup/restore method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide technology of backing up data of a virtualized disk area to a magnetic tape and restoring the backup data to a virtualized disk. <P>SOLUTION: When backing up data of the virtualized disk area to the magnetic tape, the backup server device extracts data in only a physical disk area. At the time of restore, the data is written in the address of the backed up data, thereby enabling restore to the virtualized disk area. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hardware and software technology for backing up / restoring a virtualized disk area to a storage device.

  Conventionally, a method of backing up a virtualized disk area to a storage device (for example, a magnetic tape) has become common. As shown in Conventional Example 1 of FIG. 8, when reading data for backup to magnetic tape, the backup processing program uses the same virtual disk as that seen from the host (server side) for the virtual disk. appear. Therefore, all data on the virtualized disk (data that can be seen from the host side) is collected on the magnetic tape. As a result, a physical disk of the size of the virtualized disk is used as backup data on the magnetic tape. Saved.

  When restoring, the data on the magnetic tape is restored as it is, so it is restored to a physical disk area that is larger than the virtualized disk area, which requires a larger actual capacity than at the time of backup. come.

  On the other hand, in Patent Document 1, as shown in FIG. 9, map information for managing the correspondence between a virtual disk and a physical disk is held in a memory on a virtual device, and the information is obtained at the time of backup. There has been proposed a method of directly reading / writing data between a magnetic tape and a physical disk (separate storage device) without issuing a data read / write request to the virtualization device from the host.

  However, as shown in FIG. 10, at the time of restoration, the physical disk for the virtual disk is specified and restored to the specified physical disk. In this case, since the virtualized data structure collected at the time of backup cannot be conscious, If it is not the meaningful data area (that is, the total number of virtual disks = physical disks), it cannot be recognized as meaningful data from the business server on the virtual disks.

  Therefore, if the virtual disk size is larger than the physical disk size, the capacity will be insufficient, and in order to restore to the area where the data has been collected, it is necessary to temporarily prepare a physical disk in another area for restoration. Occurs. In other words, at the same time as extra resources are required, the restoration time becomes longer because restoration is required once in another area.

As described above, in the conventional technology, the amount of data at the time of backup and the amount of data at the time of restoration become the disk size of the virtual data, so the amount of data is larger than the physical disk size, and the backup time and restore time. Has the problem of becoming longer.
JP 2007-199756 A

  Therefore, in order to solve the above-described problems, in the present invention, when backing up a virtualized disk area to a storage device such as a magnetic tape, only the physical disk area is collected and backed up at the time of restoration. Provided is a backup server device that enables restoration to a virtualized disk area by using a mechanism for writing to a data address position at the time.

  The backup server device according to the present invention provides backup / backup of data in a virtual disk area in a disk array device by a backup program that saves data from a virtual disk to a storage device and a restore program that returns data from the storage device to the virtual disk. Restore is possible.

  The backup program collects data for the actual physical disk area from the virtualized disk area in the disk array device, a physical disk created based on the disk management information acquired from the disk array device, The virtual disk includes a correspondence address table, and a step of writing a table associating a physical disk address of the correspondence address table and a magnetic tape block together with the collected data into the storage. The step of clearing the mapping of the virtual disk area, reading the data on the storage device, the physical disk address from the table stored on the storage device, and the address of the virtual disk from the corresponding disk table held in the memory specific A step that, by constituting a step of writing physical disk data on the storage device to the specified location and the backup / restore data virtualization disk space in the disk array device can be realized.

  As described above, according to the present invention described above, the restoration time can be greatly shortened and the capacity of the disk volume to be temporarily stored can be reduced as compared with the conventional technique for backing up all the images of the virtualized disk. . Furthermore, data backed up from a storage device such as a magnetic tape can be restored without being aware of the virtualized volume.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the backup destination storage device is shown as an example assuming a magnetic tape, but the present invention is not limited to this.

  FIG. 1 shows a basic configuration of a backup / restore system according to an embodiment of the present invention. The backup system of the present invention includes a business server 3 for processing various business applications 31, a plurality of physical disks 41, a virtualized disk 42 obtained by virtualizing the plurality of physical disks 41, and addresses and virtual addresses on the physical disks. A disk array device 4 having a management information table associated with an address on the storage disk and connected to the business server 3 and the backup server device 1 via a SAN (Storage Area Network) 6, and a plurality of storages for storing backup data The tape library 2 includes a plurality of tape drives 22 and a robot that moves the magnetic tape to a predetermined position. The data on the virtual disk 42 is stored in the tape library 2. Backup processing to the original magnetic tape 21 or the original A backup server device 1 to the virtual disk performs Restorations process, and a. The business server 3 and the backup server device 1 are connected to each other via the same LAN (Local Area Network).

  Although not shown, the backup server device 1 is a computer having a CPU (Central Processing Unit) and a memory, and the backup / restore program 11 held in the memory is executed and processed by the CPU. In addition, the backup / restore program 11 may be configured to be read via a disk drive for each medium when the backup server apparatus 1 is started, and after being expanded in a memory, the CPU / execution process is executed by the CPU.

  Further, the backup / restore program 11 is stored in a computer-readable recording medium such as a hard disk, a CD (Compact Disk), a DVD (Digital Versatile DisK), a flexible disk, or a magneto-optical disk. It may be configured to be read by a medium disk drive, developed in a memory, and executed by a CPU. The mechanism of the present invention will be described below with reference to FIGS.

  FIG. 2 is a diagram schematically illustrating the backup operation according to the embodiment of the present invention. The backup program collects data for only the actual physical disk 41 area from the virtual disk 42 area of the disk array device 4, and at the same time, a bitmap of the physical disk 41 and the virtual disk 42 from the disk array device 4. Information is acquired and stored in a memory as a disk address table (abbreviation: address table). Next, a tape data address table (abbreviation: data table) in which physical disk addresses and tape blocks are associated is written on the magnetic tape 21 as management information for linking to the magnetic tape 21 together with the collected data. Based on the management information of the tape data address table and the disk address table, data can be written to the data address position at the time of backup and restored to the virtual disk 42 area.

  FIG. 3 is a diagram schematically illustrating the restore operation according to the embodiment of the present invention. The restore program first clears the virtual disk 42 area so that there is no mapping with the physical disk 41. After clearing, the data on the magnetic tape 21 is read, the address of the physical disk 41 is specified from the tape data address table stored on the magnetic tape 21, and then the disk data address table held in the memory is referred to The address of the virtualization disk 42 is specified. By writing the data of the physical disk 41 on the magnetic tape to the specified address position of the virtual disk, restoration to the virtual disk 42 is executed.

  FIG. 4 shows an example of the data structure of the disk data address table according to the embodiment of the present invention. The disk data address table is created from the bitmap information acquired from the management information table 43 managed by the disk array device 4, and is held in the memory of the backup device. The “physical disk address” and “virtualized address” Consists of multiple records consisting of items. For example, in the first record, the physical disk address (= LBA: Logical Block Address) “5” corresponds to the virtual disk address “15”.

  FIG. 5 shows an example of the data structure of the tape data address table according to the embodiment of the present invention. The tape data address table is stored as management information on the magnetic tape 21 together with the data of the physical disk 41 at the time of backup. The “physical disk address” and the data write block (tape mark or block) on the magnetic tape 21 are stored. It is composed of a plurality of records composed of items of “tape block” indicating the position of the. For example, the data stored in the position of the tape block “1” indicates that the data corresponds to the physical disk address “5”.

  FIG. 6 shows a flow of backup processing to the magnetic tape according to the embodiment of the present invention. First, in step S11, the target disk type (whether or not virtualization is performed) is acquired from the management information table 43 of the disk array device 4. In step S12, it is determined whether the backup target disk is virtualized.

  If virtualized, the physical disk 41 corresponding to the virtualized disk 42 is specified in step S13. Next, in step S14, the data of the identified physical disk 41 is read, and in step S15, correspondence information between the physical disk address read from the management information table 43 of the disk array device 4 and the virtualized disk address is acquired. In step S16, based on the acquired information, a disk data address table in which the physical disk 41 and the virtual disk 42 are associated is created and stored in the memory.

  Next, in step S 17, the read data on the physical disk 41 is written to the magnetic tape 21. Further, in step S18, a tape data address table in which the address of the physical disk 41 is associated with the written magnetic tape block is created. In step S19, the created tape data address table is written to the magnetic tape 21.

  On the other hand, if it is determined in step S12 that the target disk is not virtualized, normal backup processing is applied. In step S20, data on the physical disk 41 is read, and in step S21, the data is stored on the magnetic tape 21. Write.

  FIG. 7 shows a restore processing flow to the virtualized disk according to the embodiment of the present invention. First, in step S31, the type of disk backed up on the magnetic tape 21 is acquired. Next, in step S32, it is determined whether the backed up data is in the virtualization disk 42 area. As a result, if the backed up data is in the virtualization disk 42 area, a request for clearing the mapping between the virtualization disk 42 and the physical disk 41 as the restore destination is issued to the disk array device 4 in step S33. .

  After clearing, in step S34, the data on the magnetic tape 21 is read and the tape data address table is read. In step S35, the data on the physical disk is read from the data on the magnetic tape 21.

  Next, in step S36, the restore destination disk address is specified based on the read tape data address table and the disk data address table held in the memory. In step S37, data is written at the address position of the specified virtualization disk 42.

  On the other hand, if it is determined in step S32 that the backed up disk is not virtualized, normal restore processing is applied. In step S38, data is read from the magnetic tape 21, and in step S21, the data is transferred to the physical disk. Write to 41.

It is a figure which shows the basic composition of the backup / restore system which becomes embodiment of this invention. It is a figure which illustrates typically the operation | movement of the backup which becomes embodiment of this invention. It is a figure which illustrates typically the operation | movement of the restoration which becomes embodiment of this invention. It is a figure which shows the example of a data structure of the disk data address table which becomes embodiment of this invention. It is a figure which shows the example of a data structure of the tape data address table which becomes embodiment of this invention. It is a figure which shows the backup processing flow to the magnetic tape which becomes embodiment of this invention. It is a figure which shows the restore processing flow to the virtualization disk which becomes embodiment of this invention. It is a figure which shows the structural example 1 of the conventional backup / restoration. It is a figure which shows the structural example 2 of the conventional backup / restoration. It is a figure explaining the subject of the conventional backup / restoration.

Explanation of symbols

1 Backup server device 2 Tape library 3 Business server 4 Disk array device 5 LAN
6 SAN
7 Fiber Channel 11 Backup / Restore Program 21 Magnetic Tape 22 Tape Driver 23 Robot 31 Business Application 41 Physical Disk 42 Virtualization Disk 43 Management Information Table

Claims (3)

A backup server device for backing up / restoring virtual disk data from a disk array device to a storage device,
A means for specifying a physical disk corresponding to a virtual disk from map information managed by the disk array device and reading the data, and an address table in which the address of the virtual disk and the physical disk are associated with each other are stored in a memory. A backup processing unit comprising: means for holding; and means for writing, together with the read physical disk data, a data table in which the physical disk address and the block position of the data are associated with each other to the storage device; ,
Means for clearing the virtual disk area, means for reading the data and data table backed up in the storage device, and specifying the address of the virtual disk from the data table and an address table held in the memory, A restore processing unit configured to write data read from the storage device at the address location,
A backup server device comprising: A backup / restore program in a backup server device for backing up / restoring virtual disk data from a disk array device to a storage device,
At the time of backup,
Identifying the physical disk corresponding to the virtualized disk from the map information managed by the disk array device and reading the data;
Holding in memory an address table in which addresses of the virtualized disk and the physical disk are associated;
Along with the read physical disk data, writing a data table in which the physical disk address and the block position of the data are associated with each other to the storage device,
When restoring,
Clearing the virtualized disk area;
Reading the data and data table backed up in the storage device, and identifying the address of the virtualization disk from the data table and an address table held in the memory;
A backup / restore program for causing a computer to execute the step of writing data read from the storage device at a specified address position. A backup / restore method in a backup server device for backing up / restoring virtual disk data from a disk array device to a storage device,
At the time of backup,
Identifying the physical disk corresponding to the virtualized disk from the map information managed by the disk array device and reading the data;
Holding in memory an address table in which addresses of the virtualized disk and the physical disk are associated;
Along with the read physical disk data, writing a data table in which the physical disk address and the block position of the data are associated with each other to the storage device,
When restoring,
Clearing the virtualized disk area;
Reading the data and data table backed up in the storage device, and identifying the address of the virtualization disk from the data table and an address table held in the memory;
And a step of writing the data read from the storage device at the specified address position.

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