FILE SERVER FOR MIGRATION OF FILE AND METHOD FOR MIGRATING FILE

• US 20120101995A1
• Filed: 10/22/2010
• Published: 04/26/2012
• Est. Priority Date: 10/22/2010
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Agetsuma, Masakuni, Akagawa, Etsutaro, Ishii, Yohsuke
• Granted Patent: US 8,583,611 B2
• Time in Patent Office: Days
• US Class Current: 707/644
• CPC Class Codes: G06F 16/10 File systems; File servers
• CPC Class Codes: G06F 16/119 Details of migration of file systems migration mechanisms in storage systems G06F3/0647
• CPC Class Codes: G06F 16/185 Hierarchical storage management [HSM] systems, e.g. file migration or policies thereof details of archiving G06F16/11
• CPC Class Codes: G06F 21/604 Tools and structures for managing or administering access control systems
• CPC Class Codes: G06F 2221/2141 Access rights, e.g. capability lists, access control lists, access tables, access matrices
• CPC Class Codes: G06F 3/0605 by facilitating the interaction with a user or administrator
• CPC Class Codes: G06F 3/062 Securing storage systems
• CPC Class Codes: G06F 3/0647 Migration mechanisms
• CPC Class Codes: G06F 3/0649 Lifecycle management
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: H04L 67/1097 for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]

Abstract

A file server stores the storage management information and migration policy information. The storage management information includes the information that indicates a storage attribute for each storage apparatus. The migration policy information includes a plurality of information sets. Each of the information sets includes the information that indicates a condition of a file attribute and the information that indicates a condition of a storage attribute of a storage apparatus that is a migration destination. The file server specifies a migration target file, specifies a storage apparatus that conforms to the storage attribute condition that is indicated by the information set that includes the information that indicates a condition of a file attribute that conforms to of a file attribute of a target file based on the storage management information, and migrates a target file from a storage apparatus that has stored the target file to the storage apparatus that has been specified.

Claims

1. A file server, comprising:

a communication interface device that is coupled to a client computer and a plurality of storage apparatuses of which attribute are different;

a storage resource that stores the storage management information and migration policy information; and

a processor that is coupled to the communication interface device and the storage resource,

wherein the storage management information includes the information that indicates a storage attribute for each storage apparatus,

wherein the migration policy information includes a plurality of information sets,

each of the information sets includes the information that indicates a condition of a file attribute and the information that indicates a condition of a storage attribute of a storage apparatus that is a migration destination, and

wherein the processor executes the following steps;

(a) specifying a target file of a migration;

(b) specifying a storage apparatus that conforms to the storage attribute condition that is indicated by the information set that includes the information that indicates a condition of a file attribute that conforms to of a file attribute of a target file, based on the storage management information; and

(c) migrating a target file from a storage apparatus that has stored the target file to the storage apparatus that has been specified in the (b).

2. The file server according to claim 1, wherein:

the condition of a file attribute is an access control condition related to the access control information related to a restriction of an access to a file and the condition of a storage attribute is a credibility condition related to the credibility of a storage apparatus for at least one of the plurality of information sets,

the information that indicates the storage attribute includes the information that indicates a level of the credibility for the storage management information, and

the processor specifies a storage apparatus that conforms to the credibility condition that is indicated by the information set that includes the information that indicates the access control condition that conforms to the access control information of the target file based on the storage management information in the (b).

3. The file server according to claim 2, wherein:

the plurality of storage apparatuses includes a storage apparatus of a first kind, a storage apparatus of a second kind that is provided with a credibility lower than that of the storage apparatus of the first kind, and a storage apparatus of a third kind that is provided with a credibility lower than that of the storage apparatus of the second kind,

in the case in which the processor receives a write command from the client, the processor stores a file that accompanies with the write command into the storage apparatus of the first kind regardless of an attribute of the file,

the plurality of information sets includes a first information set and a second information set,

the first information set includes the information that indicates the access control condition related to the access control information of a file that is provided with a low importance and the information that indicates the credibility condition that indicates that the credibility of a storage apparatus is low,

the second information set includes the information that indicates the access control condition related to the access control information of a file that is provided with a high importance and the information that indicates the credibility condition that indicates that the credibility of a storage apparatus is high,

the target file that is specified in the (a) is a file that has been stored into the storage apparatus of the first kind, in the (b), in the case in which the access control information of the target set conforms to the access control condition that is specified by the first information set, the processor specifies the storage apparatus of the second kind that conforms to the credibility condition that is specified by the first information set from the storage management information, in the (b), in the case in which the access control information of the target set conforms to the access control condition that is specified by the second information set, the processor specifies the storage apparatus of the third kind that conforms to the credibility condition that is specified by the second information set from the storage management information, and in the (c), the processor migrates the target file from the storage apparatus of the first kind to the storage apparatus of the second kind that has been specified in the (b) or the storage apparatus of the third kind that has been specified in the (b).

4. The file server according to claim 3, wherein:

a condition of a file attribute is an access frequency condition related to an access frequency of a file and a condition of a storage attribute is a performance condition related to an access performance of a storage apparatus for at least one of the plurality of information sets,

in the (b), there are the information set that indicates the access control condition that conforms to the access control information of the target file and the information set that indicates the access frequency condition that conforms to an access frequency of the target file as the information set that conforms to a file attribute of the target file, and

the processor specifies a storage apparatus that conforms to all of the storage attribute conditions that are indicated by the information sets based on the storage management information.

5. The file server according to claim 4, wherein:

the plurality of information sets is classified into a plurality of hierarchies,

in the (b), the processor searches an information set that conforms to a file attribute of the target file in the range of a layer of an upper level and a layer of a lower level, and an information set of a type (y) belongs to a layer of a lower level as compared with an information set of a type (x);

(x) a condition of a file attribute is an access frequency condition related to an access frequency of a file and a condition of a storage attribute is a performance condition related to an access performance of a storage apparatus; and

(y) a condition of a file attribute is the access control condition related to the access control information related to a restriction of an access to a file and the condition of a storage attribute is a credibility condition that is a condition of the credibility of a storage apparatus.

6. The file server according to claim 5, wherein:

the storage resource that stores the trigger management information,

the trigger management information includes the information that indicates a trigger and the information that indicates any one of the information sets that belong to the highest level layer for each trigger,

the processor detects a trigger of a migration, and

in the (a), the processor specifies the information set that belongs to the highest level layer that is corresponded to the detected trigger based on the trigger management information and specifies a file that conforms to the file attribute condition that is indicated by the specified information set among a plurality of files that have been stored into the local storage apparatus as the target file.

7. The file server according to claim 2, wherein:

a condition of a file attribute is an access frequency condition related to an access frequency of a file and a condition of a storage attribute is a performance condition related to an access performance of a storage apparatus for at least one of the plurality of information sets,

in the (b), there are the information set that indicates the access control condition that conforms to the access control information of the target file and the information set that indicates the access frequency condition that conforms to an access frequency of the target file as the information set that conforms to a file attribute of the target file, and

the processor specifies a storage apparatus that conforms to all of the storage attribute conditions that are indicated by the information sets based on the storage management information.

8. The file server according to claim 7, wherein:

in the (b), in the case in which there are at least two storage apparatuses that conform to all of the storage attribute conditions, the processor concentrates the at least two storage apparatuses to one storage apparatus in accordance with the prescribed rules and regulations or in a random manner.

9. The file server according to claim 8, wherein:

in the (b), the storage apparatus that has been concentrated in accordance with the prescribed rules and regulations is a storage apparatus in which a cost per a storage area of a unit size is lowest for the at least two storage apparatuses.

10. The file server according to claim 1, wherein:

the plurality of information sets is classified into a plurality of hierarchies, and

in the (b), the processor searches an information set that conforms to a file attribute of the target file in the range of a layer of an upper level and a layer of a lower level.

11. The file server according to claim 10, wherein:

the storage resource that stores the trigger management information,

the trigger management information includes the information that indicates a trigger and the information that indicates any one of the information sets that belong to the highest level layer for each trigger,

the processor detects a trigger of a migration, and

in the (a), the processor specifies the information set that belongs to the highest level layer that is corresponded to the detected trigger based on the trigger management information and specifies a file that conforms to the file attribute condition that is indicated by the specified information set as the target file.

12. The file server according to claim 11, wherein:

the trigger management information includes the information that indicates a condition related to an attribute of storage apparatus of a migration source of a file, and

in the (a), the processor specifies a storage apparatus that conforms to a condition related to an attribute of a storage apparatus of a migration source that is corresponded to the detected trigger based on the trigger management information and the storage management information and specifies a file that conforms to the file attribute condition that is indicated by the information set that belongs to the highest level layer that is corresponded to the detected trigger among at least one file that has been stored into the specified storage apparatus as the target file.

13. The file server according to claim 10, wherein:

in the (b), the processor decides that a migration of the target file is not executed in the case in which there is a layer in which the information set that indicates a file attribute condition that conforms to of a file attribute of a target file is not found.

14. A file migration method comprising the steps of:

(a) specifying a target file from a plurality of files;

(b) referring to a storage resource that has stored the following information;

(x) the storage management information that includes the information that indicates a storage attribute for each storage apparatus; and

(y) the migration policy information that includes a plurality of information sets that include the information that indicates a condition of a file attribute and the information that indicates a condition of a storage attribute of a storage apparatus that is a migration destination,

(c) specifying a storage apparatus that conforms to the storage attribute condition that is indicated by the information set that includes the information that indicates a file attribute condition that conforms to of a file attribute of a target file from the plurality of storage apparatuses based on the storage management information, and

(d) migrating the target file from a storage apparatus that has stored the target file to the storage apparatus that has been specified in the (c) among the plurality of storage apparatuses that are provided with different storage attributes.

15. A computer program that makes a computer execute a method comprising the steps of:

(a) specifying a target file from a plurality of files;

(b) referring to a storage resource that has stored the following information;

(x) the storage management information that includes the information that indicates a storage attribute for each storage apparatus; and

(y) the migration policy information that includes a plurality of information sets that include the information that indicates a condition of a file attribute and the information that indicates a condition of a storage attribute of a storage apparatus that is a migration destination,

(c) specifying a storage apparatus that conforms to the storage attribute condition that is indicated by the information set that includes the information that indicates a file attribute condition that conforms to of a file attribute of a target file from the plurality of storage apparatuses based on the storage management information, and

(d) migrating the target file from a storage apparatus that has stored the target file to the storage apparatus that has been specified in the (c) among the plurality of storage apparatuses that are provided with different storage attributes.