JP6384094B2 - Storage system - Google Patents

Description

  The present invention relates to a storage system, and more particularly to a storage system that performs backup.

  In a hierarchical storage system composed of a primary storage for business and a secondary storage for backup, data in the primary storage is backed up to the secondary storage. In this backup process, either of the following two backup methods is usually adopted.

(1) File backup Mount the backup target disk in the primary storage with the backup server, analyze the file system, and back up to the secondary storage in file units.
(2) RAW backup The contents of the backup target disk in the primary storage are not analyzed and there is no need to use a backup server, and the disk image is directly backed up to the secondary storage in units of RAW blocks.

  Here, the secondary storage used when performing large-generation backup of large-capacity data has a deduplication function, identifies duplicate data, and stores only non-duplicate data on the disk. This achieves high capacity efficiency and shortens the backup time. A method in which the primary storage calculates deduplication using deduplication information of the secondary storage is disclosed in Patent Document 1.

Special table 2012-533126 gazette

  When the primary storage data is regularly backed up to the deduplication secondary storage, it is necessary to complete the backup within a specified period. However, even if the same data is backed up, the time taken for the backup differs by adopting either the file backup method or RAW backup method described above, so the backup cannot be completed within the specified period. Occurs. That is, there is a problem that the backup time cannot be shortened.

  Therefore, an object of the present invention is to provide a storage system that can solve the above-described problem that the backup time cannot be shortened.

A storage system according to an aspect of the present invention
Backup method determination means for determining whether to use the file backup method or the RAW backup method as a method for backing up the data stored in the primary storage to the secondary storage;
Backup means for backing up the data stored in the primary storage to the secondary storage using the backup method determined by the backup method determination means;
The backup method determination means includes a time required for performing a backup in the file backup method based on data stored in the primary storage and data stored in the secondary storage, and the RAW backup method. Calculating the backup time difference, which is the difference between the time taken when the backup was performed at and determining the backup method used in the backup means based on the backup time difference,
The configuration is as follows.

Moreover, the program which is the other form of this invention is:
In the information processing device,
Backup method determination means for determining whether to use the file backup method or the RAW backup method as a method for backing up the data stored in the primary storage to the secondary storage;
A backup unit that backs up the data stored in the primary storage to the secondary storage using the backup method determined by the backup method determination unit,
The backup method determination means includes a time required for performing a backup in the file backup method based on data stored in the primary storage and data stored in the secondary storage, and the RAW backup method. Calculating the backup time difference, which is the difference between the time taken when the backup was performed at and determining the backup method used in the backup means based on the backup time difference,
The configuration is as follows.

In addition, the backup method according to another aspect of the present invention includes
Determine whether to use the file backup method or the RAW backup method to back up the data stored in the primary storage to the secondary storage.
A backup method for backing up the data stored in the primary storage to the secondary storage using the determined backup method,
Based on the data stored in the primary storage and the data stored in the secondary storage, the time taken when performing the backup by the file backup method, and when performing the backup by the RAW backup method Calculating a backup time difference that is a difference between the time and determining a backup method to be used in the backup unit based on the backup time difference;
The configuration is as follows.

  The present invention is configured as described above, so that the backup time can be shortened.

1 is a block diagram showing an outline of a configuration of a storage system in the present invention. FIG. 2 is a functional block diagram illustrating configurations of a primary storage and a secondary storage disclosed in FIG. 1. FIG. 3 is a diagram illustrating an example of a file system information management table, a backup method management table, and an update data check result management table disclosed in FIG. 2. 3 is a flowchart illustrating an operation in a file system analysis unit of the storage system disclosed in FIG. 2. 3 is a flowchart illustrating an operation in a deduplication rate calculation unit of the storage system disclosed in FIG. 2. 3 is a flowchart illustrating an operation in a backup method determination unit of the storage system disclosed in FIG. 2. 3 is a flowchart illustrating an operation in a backup unit of the storage system disclosed in FIG. 2. 3 is a flowchart showing an operation in an update data check unit of the storage system disclosed in FIG. 2. It is a block diagram which shows the structure of the storage system in attachment 1 of this invention.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. 1 to 3 are diagrams for explaining the configuration of the storage system, and FIGS. 4 to 9 are diagrams for explaining the operation of the storage system.

[Constitution]
As shown in FIG. 1, the storage system 1 includes a primary storage 10 that operates for business use and a secondary storage 20 that operates for backup.

  The primary storage 10 is composed of an information processing device including an arithmetic device and a storage device. In the storage device of the primary storage 10, a business volume 11 in which business data is stored is formed as shown in FIG. The primary storage 10 takes a primary backup of the transaction volume 11 inside the storage before backing up the transaction volume 11 to the primary storage 20 as will be described later. The primary backup 12 is formed in the storage device. Then, the primary storage 10 performs processing for further backing up the primary backup 12 of the business volume 11 to the secondary storage 20, as will be described later. This backup process is performed by one of the following two backup methods.

(1) File backup method The data of the business volume 11 to be backed up in the primary storage 10 is mounted by a backup server (not shown), the file system is analyzed, and the data is backed up to the secondary storage 20 in units of files.
(2) RAW backup method The contents of the transaction volume 11 to be backed up in the primary storage 10 are not analyzed, and it is not necessary to use a backup server, and the disk image is directly backed up to the secondary storage 20 in units of RAW blocks.

  Moreover, the secondary storage 20 is comprised with the information processing apparatus provided with the arithmetic unit and the memory | storage device. A secondary backup 22 in which data backed up from the primary storage 10 is stored is formed in the storage device of the secondary storage 20. Since the secondary storage 20 has a deduplication function (deduplication unit 21), it identifies the already stored duplicate data among the backup data and saves only non-duplicate data to the disk. Hereinafter, each configuration will be further described in detail.

  As shown in FIG. 2, the primary storage 10 includes a file system analysis unit 111, a deduplication rate calculation unit 112, a backup method determination unit 113, which are constructed by incorporating a program into an installed arithmetic device. A backup unit 114 and an update data check unit 115 are provided. The primary storage 10 includes the above-described business volumes 101, 102, and 103, the file system information management table 121, the backup method management table 122, and the update data check result management table 123 in the storage device provided. It is remembered. Although not shown, the storage device of the primary storage 10 also stores primary backups of the business volumes 101, 102, and 103.

  When taking the primary backup 12 from the business volume 11, the file system analysis unit 111 analyzes the contents of the primary backup as a file system and stores the analysis result in the file system information management table 121. For example, as shown in the information stored in the file system information management table 121 in FIG. 3A, the file system analysis unit 111 analyzes the capacity, the number of used blocks, and the number of files from the file system. However, the analysis content by the file system analysis unit 111 is not limited to the content described above.

  The deduplication rate elimination calculation unit 112 calculates a deduplication rate when backup is performed using the file backup method and a deduplication rate when backup is performed using the RAW backup method. At this time, first, the primary storage 10 stores a deduplication table cache 124 that is a copy of the deduplication table 220 stored in the secondary storage 20. The deduplication table 220 stores hash values calculated according to the contents of data already stored in the secondary storage 20.

  First, in the case of the file backup method, the deduplication rate calculation unit 112 reads the file of the business volume 11 to be backed up, divides it into chunks of a predetermined capacity, and data contents of the chunk The hash value corresponding to is calculated. When the same value as the hash value calculated from the chunk exists with reference to the deduplication table cache 124, it is determined that the chunk is already stored in the secondary storage 20 and is duplicate data. Finally, the ratio of chunks determined to be duplicated data to the entire business volume 11 is obtained and used as the deduplication rate in the case of the file backup method.

  The deduplication rate calculation unit 112 also performs the above-described processing for the RAW backup method. In the case of the RAW backup method, the business volume 11 to be backed up is read in block units, divided (chunked) into chunks of a predetermined capacity, and the hash value of the chunk is calculated. When the same value as the hash value calculated from the chunk exists with reference to the deduplication table cache 124, it is determined that the chunk is already stored in the secondary storage 20 and is duplicate data. Finally, the ratio of chunks determined to be duplicated data to the entire business volume 11 is obtained and used as the deduplication rate in the case of the RAW backup method.

  The backup method determination unit 113 (backup method determination means) determines which of the file backup method and the RAW backup method is used for backup. At this time, the backup method determination unit 113 includes the data of the file system information management table 121, which is the analysis result of the file system by the file system analysis unit 111, and the deduplication rate in each backup method by the deduplication rate calculation unit 112. , To determine.

  When determining the backup method, the backup method determination unit 113 determines the backup time that is the difference between the time taken when performing the backup using the file backup method and the time taken when performing the backup using the RAW backup method. The difference is calculated and a determination is made based on the difference in the backup time. Here, the time required for backup is the following three stages.

(1) Data reading time on the primary storage side First, when performing backup, it takes time to read data to be backed up in the primary storage 10. In the file backup method, an overhead occurs in the data reading time as compared with the RAW backup method. The overhead of this data reading time is proportional to the number of files. For this reason, the backup method determination unit 113 calculates the data reading time in the file backup method using the number of files in the file system information management table 121, and compares the time with the data reading time in the RAW backup method. (ΔR). For example, when backing up a disk having a large number of files, it takes a long time to read data due to the overhead of opening and closing the files. If it takes 10msec to access one file, the overhead is about 2.5 hours per 1 million files.

(2) Data transfer time between storages Next, when performing backup, it takes data transfer time to transfer data from the primary storage 10 to the secondary storage 20. This data transfer time can be obtained by the data transfer amount / line speed. Since the data transfer amount is the file system capacity in the file backup method, the data transfer time in the file backup method is calculated using the file system capacity in the file system information management table 121. In the case of the RAW backup method, the data transfer amount is a preset block size × the number of blocks. Therefore, the data transfer time in the RAW backup method is calculated using the number of blocks in the file system information management table 121. . Then, the difference (ΔT) in data transfer time in each backup method is calculated. In the case of the RAW backup method, data is read in units of blocks and transferred to the secondary storage 20. Therefore, even if invalid data is included in a block, it is transferred and backed up. For this reason, the data transfer amount may be larger than that of the file backup method in which only valid data is transferred, and this data transfer may take time and may cause a difference.

(3) Data writing time on the secondary storage side Finally, it takes time to write data in the secondary storage 20 when performing backup. In this data writing process, only the data that has not been deduplicated is written to the disk by the deduplication function of the secondary storage 20, so the higher the deduplication rate, the shorter the data write time. The data write time can be calculated by (data transfer amount × (1-deduplication rate)) / write speed. Therefore, in the case of the file backup method, the file system capacity of the file system information management table 121 is used as the data transfer amount, and the deduplication rate is acquired from the deduplication rate calculation unit 112 to calculate the data write time. Further, in the case of the RAW backup method, the data transfer amount is calculated from the number of blocks in the file system information management table 121, and the deduplication rate is acquired from the deduplication rate calculation unit 112 to calculate the data write time. Then, the difference (ΔW) in data writing time in each backup method is calculated.

  The backup method determination unit 113 calculates the sum (ΔR + ΔT + ΔW) of each time difference in each backup method calculated as described above as a backup time difference, which is a time difference when backup is performed in each backup method. . Then, the backup method determination unit 113 determines whether the backup time is short in the file backup method or the RAW backup method from the calculated backup time difference, selects the backup method with a short backup time, and manages the backup method. Stored in Table 122. For example, as shown in FIG. 3, the backup method management table 122 stores the backup method (File backup or RAW backup) determined and selected for each of the business volumes 101, 102, and 103.

  The backup method determination unit 113 determines the backup method when there is no entry in the backup method management table 122 when taking the primary backup 12 of the transaction volume 11 as described above. When the backup method already exists, it is not necessary to determine the backup method again, and the determination of the backup method for one transaction volume 11 is only required once. However, the backup method determination unit 113 may determine the backup method and update the backup method management table 122 each time a business volume primary backup is taken.

  The backup method determination unit 113 also has a high deduplication rate when the above-described backup time difference is small, for example, when the backup time difference is within a certain range (within 5% of one backup time). And the backup management table 122 is updated.

  The backup unit 114 (backup means) refers to the backup method management table 122 when acquiring the secondary backup 22 (201, etc.) to the secondary storage 20, and acquires the backup method for each backup target. Then, a secondary backup is taken to the secondary storage 20 by that method.

  Here, after the full backup that backs up all the data of the transaction volume 11 (primary backup 12), the backup unit 114 performs a differential backup that backs up only the differential data updated in the primary storage 10 to the secondary storage 20. At this time, the differential backup is also performed by the backup method stored in the backup method management table 122. However, in the case of differential backup, the backup time for file backup and RAW backup differs depending on the data update pattern. For this reason, the update data check unit 115 checks the data update pattern every time differential backup is performed, and reviews the backup method based on the tendency.

  As a data update pattern that affects the backup time of differential backup, there is a case where a large file is partially updated. In this case, if the difference is in file units, the transfer data amount is the size of the update file, but if it is block transfer, only the block size of the update portion is obtained. In some cases, a file is replaced, such as defragmentation. In this case, many blocks are updated, and the data transfer amount per block is larger than the file unit.

  From the above, the update data check unit 115 checks whether the data transfer amount of the difference in file units or the difference in block units is larger each time the primary backup 12 is updated by the differential backup from the business volume 11. To do. Then, the update data check unit 115 stores the number of primary backups and the number of times that the data transfer amount is determined to be small in one backup method in the update data check result management table 123. In the example of FIG. 3C, the number of times of primary backup (Count) and the number of times that the RAW backup method is determined to have a smaller data transfer amount (Block) are stored for each business volume. Then, the update data check unit 115 determines the backup method based on the data in the update data check result management table 123 and updates the backup method management table 122. Thereby, the backup unit 114 performs differential backup by the updated backup method.

[Operation]
Next, the operation of the above-described storage system 1 will be described with reference mainly to the flowcharts of FIGS. The following description will be divided into an operation during full backup operation that backs up all data in the business volume 11 of the primary storage 10 to the secondary storage 20, and an operation during differential backup operation that backs up updated differential data. .

(Full backup operation)
First, it is assumed that the business volumes 101, 102, and 103 (11) are used from a file server and a large amount of small files are stored. When the primary backup of the transaction volume 101 is taken in the primary storage 10, there is no entry in the backup method management table 122, and the backup method is determined.

  The file system analysis unit 111 mounts the disk image of the business volume 101 on the backup server, and analyzes the file system (NTFS, ext3, etc.) (step S1 in FIG. 4). Then, the file system capacity, the number of used blocks, and the number of files, which are the analysis results, are stored in the file system information management table 121 (step S2 in FIG. 4).

  Further, in the case of the file backup method, the deduplication rate calculation unit 112 first reads a file such as the business volume 101, divides it into chunks having a predetermined capacity, and calculates a hash value of the chunk. (Step S11 in FIG. 5). When the same value as the hash value calculated from the chunk exists with reference to the deduplication table cache 124, it is determined that the chunk is already stored in the secondary storage 20 and is duplicate data (FIG. 5 step S12). Finally, the ratio of chunks determined to be duplicated data to the entire business volume 11 is obtained and used as the deduplication rate for the file backup method (step S13 in FIG. 5).

  As described above, the deduplication rate calculation unit 112 calculates the deduplication rate for the RAW backup method. At this time, the deduplication rate calculation unit 112 chunks blocks such as the business volume 101 to be backed up and obtains a hash value thereof (step S11 in FIG. 5). Thereafter, the same processing as described above is performed (step S12 in FIG. 5), and the deduplication rate in the case of the RAW backup method is set (step S13 in FIG. 5).

  Next, the backup method determination unit 113 selects a backup method as shown in FIG. First, the backup method determination unit 113 acquires information on the file system capacity, the number of files, and the number of used blocks from the file system information management table 121 (step S21 in FIG. 6). Then, the backup method determination unit 13 uses the acquired number of files to calculate the time required for data reading in the file backup method. For example, if it takes 10 msec to access one file, if there are 1 million files in the file system, the reading time is 2.5 hours. The calculated data reading time in the file backup method is calculated as a difference (ΔR) in data reading time between the file backup method and the RAW backup method (step S22 in FIG. 6).

  Subsequently, the backup method determination unit 113 calculates the difference (ΔT) in the data transfer amount between the file backup method and the RAW backup method using the file system capacity and the number of used blocks (step S23 in FIG. 6). For example, if the read block size of RAW backup is 256 MB, the difference in data transfer time can be calculated by ΔT = ((file system capacity− (256 MB × number of blocks)) / line speed. The system method is calculated as such a data transfer time than the RAW backup method, and if the RAW back backup method includes useless data, it becomes a negative value.

  Further, the backup method determination unit 113 acquires the deduplication rate for each file backup method from the deduplication rate calculation unit 112. Then, the backup method determination unit 113 uses the acquired deduplication rate and the data transfer amount (file system capacity and number of used blocks) to calculate the difference (ΔW) in the data write time between the file backup method and the RAW backup method. Calculate (step S24 in FIG. 6). For example, the difference in write time is ΔW = ((file backup method: data transfer amount × (1-deduplication rate) − (RAW backup method: data transfer amount × (1-deduplication rate))) / write speed. It can be calculated.

  Then, the backup method determination unit 113 checks the total difference (ΔR + ΔT + ΔW) calculated as described above (step S25 in FIG. 6), selects a backup method with a short backup time, and performs backup method management. The data is stored in the table 122 (steps S26 and S27 in FIG. 6). At this time, if the backup time difference is within a certain range (for example, within 5% of the shorter backup time), the backup method determination unit 113 selects a backup method with a high deduplication rate (FIG. 6). Step S28). The backup method determination unit 113 selects a backup method having a high deduplication rate when the difference value of the backup time is within a preset value range (for example, within ± a). Also good.

  After that, the backup unit 114 acquires the backup method of the backup target disk from the backup method management table 122 when taking a secondary backup (steps S31 and S32 in FIG. 7). In the case of the file backup method, the backup unit 114 uses the file system analysis unit 111 to read a file from the file system and back it up to the secondary storage 20 (step S33 in FIG. 7). In the case of RAW backup, data on the disk itself is simply read and backed up to the secondary storage 20 (step S34 in FIG. 7).

(Differential backup operation)
As described above, when operating with differential backup after a full backup, the disk image is mounted (step S41 in FIG. 8) and updated by the update data check unit 115 each time the primary backup is updated. The data capacity of the file and update block is checked (steps S42 and S43 in FIG. 8). Thereby, the data transfer amount of both the difference data in file units and the difference data in block units is checked. Then, the update data check unit 115 determines which data transfer amount is smaller in file units or block units, and stores a value based on the result in the update data check result management table 123 (FIG. 8). Step S44). Specifically, the update data check unit 115 stores the number of times of differential backup to the primary backup (Count) and the number of times that the data transfer amount is determined to be small (Block) in the update data check result management table 123. save.

  When the number of differential backups (Count) reaches a certain number (for example, 10) (step S45 in FIG. 8: Yes), the update data check unit 115 determines that the data transfer amount is small in block units (Yes) Block) is confirmed (step S46 in FIG. 8). When the number of times that the data transfer amount is determined to be small in block units (Block) is more than half (5 times or more) of the number of differential backups (Count) (step S46 in FIG. 8: 50% or more), a trend Therefore, it is determined that the RAW backup method is advantageous (step S48 in FIG. 8). On the other hand, when the number of times that the data transfer amount is determined to be small (Block) is less than half (less than 5) of the differential backup count (Count) (step S46 in FIG. 8: less than 50%) Then, it is determined that the file backup method is advantageous (step S47 in FIG. 8).

  Then, the update data check unit 115 updates the backup method management table 122 to the method determined to be advantageous (steps S47 and S48 in FIG. 8), and resets the Count value of the update data check result management table 123 to 0 ( Step S49 in FIG. Thereafter, the differential backup by the backup unit 114 is performed by the updated backup method.

  As described above, according to the present invention, an optimal backup method can be automatically selected according to the characteristics of data in the primary storage, and backup can be realized in the shortest backup time. As a result, it is possible to reduce the possibility that the backup cannot be completed within the specified period by shortening the backup time.

  In the present invention, when the equivalent backup time can be obtained, a backup method with a high deduplication rate in the secondary storage is selected. As a result, the disk capacity required for backup can be reduced.

<Appendix>
Part or all of the above-described embodiment can be described as in the following supplementary notes. The outline of the configuration of the storage system (see FIG. 9), program, and backup method in the present invention will be described below. However, the present invention is not limited to the following configuration.

(Appendix 1)
Backup method determination means for determining whether to use the file backup method or the RAW backup method as a method for backing up the data stored in the primary storage to the secondary storage;
Backup means for backing up the data stored in the primary storage to the secondary storage using the backup method determined by the backup method determination means;
The backup method determination means includes a time required for performing a backup in the file backup method based on data stored in the primary storage and data stored in the secondary storage, and the RAW backup method. Calculating the backup time difference, which is the difference between the time taken when the backup was performed at and determining the backup method used in the backup means based on the backup time difference,
Storage system.

(Appendix 2)
The storage system according to attachment 1, wherein
The backup method determination means calculates the backup time difference using a result of analyzing data stored in the primary storage.
Storage system.

(Appendix 3)
The storage system according to appendix 2,
The backup method determination means calculates the difference in data read time between the file backup method and the RAW backup method using the number of files included in the file system stored in the primary storage, and the data read time The backup time difference is calculated using the difference of
Storage system.

(Appendix 4)
The storage system according to appendix 2 or 3,
The backup method determination means uses the file system capacity stored in the primary storage and the number of blocks included in the RAW data to determine the difference in data transfer time between the file backup method and the RAW backup method. And calculating the backup time difference using the difference in the data transfer time,
Storage system.

(Appendix 5)
The storage system according to any one of appendices 1 to 4,
The backup method determination means performs backup in each of the file back method and the RAW backup method based on the data stored in the primary storage and the data stored in the secondary storage. Calculating the duplicate storage exclusion rate at the time, and calculating the backup time difference using the calculated duplicate storage exclusion rate in each method,
Storage system.

(Appendix 6)
The storage system according to appendix 5,
The backup method determination means calculates a difference in data writing time between the file backup method and the RAW backup method using the calculated duplicate storage exclusion rate in each method, and uses the difference in the data writing time. Calculating the backup time difference;
Storage system.

(Appendix 7)
The storage system according to attachment 1, wherein
The backup method determination means includes
Using the number of files included in the file system stored in the primary storage, calculate the difference in data read time between the file backup method and the RAW backup method,
Using the capacity of the file system stored in the primary storage and the number of blocks included in the RAW data, the difference in data transfer time between the file backup method and the RAW backup method is calculated,
Based on the data stored in the primary storage and the data stored in the secondary storage, the duplicate storage exclusion rate when backup is performed by each of the file back method and the RAW backup method. Calculate the difference in data write time between the file backup method and the RAW backup method using the calculated duplicate storage exclusion rate in each method,
Using the data read time difference, the data transfer time difference, and the data write time difference, the backup time difference is calculated.
Storage system.

(Appendix 7.1)
The storage system according to appendix 6 or 7, wherein
When the calculated backup time difference is within a predetermined range, the backup method determining means determines whether the backup with the higher duplicated storage exclusion rate calculated in each case of the file backup method and the RAW backup method. Decide to use the method,
Storage system.

(Appendix 8)
The storage system according to any one of appendices 1 to 7,
The backup means performs a differential backup in which the differential data updated in the primary storage is backed up to the secondary storage in the backup system determined by the backup system determination means,
The backup method determining means determines a backup method to be used when performing the differential backup, based on a data transfer amount when backup is performed in each of the file backup method and the RAW backup method.
Storage system.

(Appendix 8.1)
The storage system according to attachment 8, wherein
The backup method determination means counts the number of times of the smaller data transfer amount in each of the file backup method and the RAW backup method, and uses the backup when performing the differential backup based on the number of times Determine the method,
Storage system.

(Appendix 9)
In the information processing device,
Backup method determination means for determining whether to use the file backup method or the RAW backup method as a method for backing up the data stored in the primary storage to the secondary storage;
A backup unit that backs up the data stored in the primary storage to the secondary storage using the backup method determined by the backup method determination unit,
The backup method determination means includes a time required for performing a backup in the file backup method based on data stored in the primary storage and data stored in the secondary storage, and the RAW backup method. Calculating the backup time difference, which is the difference between the time taken when the backup was performed at and determining the backup method used in the backup means based on the backup time difference,
program.

(Appendix 10)
Determine whether to use the file backup method or the RAW backup method to back up the data stored in the primary storage to the secondary storage.
A backup method for backing up the data stored in the primary storage to the secondary storage using the determined backup method,
Based on the data stored in the primary storage and the data stored in the secondary storage, the time taken when performing the backup by the file backup method, and when performing the backup by the RAW backup method Calculating a backup time difference that is a difference between the time and determining a backup method to be used in the backup unit based on the backup time difference;
Backup method.

(Appendix 10.1)
The backup method according to appendix 10, wherein
When determining the backup method,
Using the number of files included in the file system stored in the primary storage, calculate the difference in data read time between the file backup method and the RAW backup method,
Using the capacity of the file system stored in the primary storage and the number of blocks included in the RAW data, the difference in data transfer time between the file backup method and the RAW backup method is calculated,
Based on the data stored in the primary storage and the data stored in the secondary storage, the duplicate storage exclusion rate when backup is performed by each of the file back method and the RAW backup method. Calculate the difference in data write time between the file backup method and the RAW backup method using the calculated duplicate storage exclusion rate in each method,
A backup method for calculating the backup time difference from the difference in the data reading time, the difference in the data transfer time, and the difference in the data writing time, and using the backup method based on the backup time difference. to decide,
Backup method.

(Appendix 10.2)
The backup method according to appendix 10 or 10.1,
When performing the backup, in the determined backup method, performing a differential backup that backs up the differential data updated in the primary storage to the secondary storage,
When determining the backup method, the backup method used when the differential backup is performed is determined based on the data transfer amount when the backup is performed by each of the file backup method and the RAW backup method. ,
Backup method.

  Note that the above-described program is stored in a storage device or recorded on a computer-readable recording medium. For example, the recording medium is a portable medium such as a flexible disk, an optical disk, a magneto-optical disk, and a semiconductor memory.

  Although the present invention has been described with reference to the above-described embodiment and the like, the present invention is not limited to the above-described embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Storage system 10 Primary storage 11 Business volume 12 Primary backup 20 Secondary storage 21 Deduplication unit 22 Secondary backup 101,102,103 Business volume 111 File system analysis unit 112 Deduplication rate calculation unit 113 Backup method judgment unit 114 Backup unit 115 Update data check unit 121 File system information management table 122 Backup method management table 123 Update data check result management table 124 Deduplication table 201, 202, 203 Secondary backup 220 Deduplication table cache 300 Storage system 301 Backup method judgment unit 302 Backup unit 310 Primary storage 320 Secondary storage

Claims (10)

Backup method determination means for determining whether to use the file backup method or the RAW backup method as a method for backing up the data stored in the primary storage to the secondary storage;
Backup means for backing up the data stored in the primary storage to the secondary storage using the backup method determined by the backup method determination means;
The backup method determination means includes a time required for performing a backup in the file backup method based on data stored in the primary storage and data stored in the secondary storage, and the RAW backup method. Calculating the backup time difference, which is the difference between the time taken when the backup was performed at and determining the backup method used in the backup means based on the backup time difference,
Storage system. The storage system according to claim 1,
The backup method determination means calculates the backup time difference using a result of analyzing data stored in the primary storage.
Storage system. The storage system according to claim 2,
The backup method determination means calculates the difference in data read time between the file backup method and the RAW backup method using the number of files included in the file system stored in the primary storage, and the data read time The backup time difference is calculated using the difference of
Storage system. The storage system according to claim 2 or 3,
The backup method determination means uses the file system capacity stored in the primary storage and the number of blocks included in the RAW data to determine the difference in data transfer time between the file backup method and the RAW backup method. And calculating the backup time difference using the difference in the data transfer time,
Storage system. The storage system according to any one of claims 1 to 4,
Said backup scheme decision means, the data stored in the primary storage based on the data stored in the secondary storage, back up in each method of the said file backup method RAW backup method And calculating the backup time difference using the calculated duplicate storage exclusion rate in each method.
Storage system. The storage system according to claim 5,
The backup method determination means calculates a difference in data writing time between the file backup method and the RAW backup method using the calculated duplicate storage exclusion rate in each method, and uses the difference in the data writing time. Calculating the backup time difference;
Storage system. The storage system according to claim 1,
The backup method determination means includes
Using the number of files included in the file system stored in the primary storage, calculate the difference in data read time between the file backup method and the RAW backup method,
Using the capacity of the file system stored in the primary storage and the number of blocks included in the RAW data, the difference in data transfer time between the file backup method and the RAW backup method is calculated,
Wherein based on the data and data stored in the primary storage is stored in the secondary storage, redundant storage rejection at the time when the backup was taken in each method of the said file backup method RAW backup method And using the duplicate storage exclusion rate in each of the calculated methods, calculate the difference in data write time between the file backup method and the RAW backup method,
Using the data read time difference, the data transfer time difference, and the data write time difference, the backup time difference is calculated.
Storage system. The storage system according to any one of claims 1 to 7,
The backup means performs a differential backup in which the differential data updated in the primary storage is backed up to the secondary storage in the backup system determined by the backup system determination means,
The backup method determining means determines a backup method to be used when performing the differential backup, based on a data transfer amount when backup is performed in each of the file backup method and the RAW backup method.
Storage system. In the information processing device,
Backup method determination means for determining whether to use the file backup method or the RAW backup method as a method for backing up the data stored in the primary storage to the secondary storage;
A backup unit that backs up the data stored in the primary storage to the secondary storage using the backup method determined by the backup method determination unit,
The backup method determination means includes a time required for performing a backup in the file backup method based on data stored in the primary storage and data stored in the secondary storage, and the RAW backup method. Calculating the backup time difference, which is the difference between the time taken when the backup was performed at and determining the backup method used in the backup means based on the backup time difference,
program. The information processing device determines whether to use the file backup method or the RAW backup method as the method for backing up the data stored in the primary storage to the secondary storage,
The information processing apparatus is a backup method for backing up the data stored in the primary storage to the secondary storage using the determined backup method,
Based on the data stored in the primary storage and the data stored in the secondary storage, the information processing apparatus takes a time when the file backup method is performed, and the RAW backup method. calculates the time taken for the time of performing a backup, the backup time difference is a difference, to determine the backup method are use to bar Kkua' flop on the basis of the backup time difference,
Backup method.

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