SERVER APPARATUS AND CONTROL METHOD OF THE SAME

• US 20120066179A1
• Filed: 09/14/2010
• Published: 03/15/2012
• Est. Priority Date: 09/14/2010
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Saika, Nobuyuki
• Granted Patent: US 8,612,395 B2
• Time in Patent Office: Days
• US Class Current: 707/634
• CPC Class Codes: G06F 11/3485 for I/O devices
• CPC Class Codes: G06F 16/178 Techniques for file synchronisation in file systems
• 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 3/061 Improving I/O performance
• CPC Class Codes: G06F 3/0647 Migration mechanisms
• CPC Class Codes: G06F 3/0653 Monitoring storage devices or systems
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]

Abstract

File migration is allowed to be properly performed while suppressing an adverse effect caused by the migration on other users. A first server apparatus 3a is communicatively coupled to a first storage apparatus 10a, and a second server apparatus 3b that is communicatively coupled to a second storage apparatus 10b, and performs management based on user quota such that a file owned by a user having a used amount exceeding a threshold based on the user quota is set as a target of migration to the second storage apparatus 10b. A file used by a plurality of users out of the files set as targets of migration is excluded from a target of the management based on user quota, and is set as a target of management based on a file quota that is the user quota supplied from a plurality of users who use the file. If the capacity of the file exceeds the file quota, the file is again set to a target of the management based on user quota.

Claims

1. A server apparatus that is a first server apparatus communicatively coupled to a client apparatus, a first storage apparatus, and a second server apparatus that is communicatively coupled to a second storage apparatus, wherein the first server apparatus

performs writing or reading of data of a file stored in the first storage apparatus, when receiving an access request to a file from the client apparatus;

manages a user quota that is information defining a limit of a used amount of storage resources by each user;

performs management based on the user quota where a file owned by a user is set as a target of migration to the second storage apparatus when the used amount of the user exceeds a threshold based on the user quota;

excludes a file, out of the files specified as targets of migration, used by a plurality of users from a target of the management based on the user quota, and sets the file as a target of management based on a file quota that is information defining a limit of capacity for each file, the file quota being the user quota supplied from the plurality of users who use the file; and

excludes the file from a target of the management based on the file quota, and sets the file as a target of the management based on the user quota when a capacity of a file set as a target of the management based on the file quota exceeds a threshold based on the file quota.

2. The server apparatus according to claim 1, wherein the first server apparatus

collects a user quota from each of users who use the file according to access frequency to the file by the user, and sets the collected user quota as the file quota when setting the file as a target of the management based on the file quota;

collects a user quota from each of users who use the file, evenly or according to access frequency to the file by the user, and sets the collected user quota as the file quota when setting the file as a target of the management based on the file quota;

determines whether a capacity of the file exceeds the threshold based on the file quota due to an update based on an update request when receiving the update request to a file stored in the first storage from the client apparatus, and again collects the user quota of users who use the file and adds the user quota to the file quota if the threshold is exceeded;

returns a file quota supplied by a user to the user quota of the user when access frequency to a file that is a target of the management based on the file quota by the user who supplies the user quota for the file is equal to or smaller than a preset threshold;

collects the user quota from a user and adds the user quota to the file quota of a file when access frequency to the file that is a target of the management based on the file quota by the user who does not supply the user quota for the file exceeds a preset threshold;

opens a file and increments a reference counter of the file when receiving an open request to the file stored in the first storage from the client apparatus;

closes a file and decrements a reference counter of the file when receiving a close request to the file stored in the first storage from the client apparatus;

stubs a file by deleting only entity of the file from the first storage apparatus and leaving only metadata of the file in a case where the reference counter of the file stored in the first storage takes a value of 0 after the file is closed in response to receiving the close request to the file from the client apparatus, and where the file is used by only its owner;

transfers data of a file to the second storage apparatus via the second server apparatus and sets the file as a target of management by replication when a replication request is generated to the file stored in the first storage apparatus;

stubs the file by deleting only entity of a file from the first storage apparatus and leaving only metadata of the file when the first server apparatus migrates the file to the second storage apparatus, the file being a target of the management by the replication and the target of migration in the management based on the user quota;

manages information indicating that synchronization processing is required to match contents of files for files that are targets of the management by the replication, when there is an unmatched content between the data of a file stored in the first storage apparatus and the data of a file stored in the second storage apparatus;

excludes a file from a target of the migration, the file specified as requiring the synchronization processing according to the information.

3. The server apparatus according to claim 1, wherein the first server apparatus

collects a user quota from each of users who use the file according to access frequency to the file by the user, and sets the collected user quota as the file quota when setting the file as a target of the management based on the file quota.

4. The server apparatus according to claim 1, wherein the first server apparatus

collects a user quota from each of users who use the file, evenly or according to access frequency to the file by the user, and sets the collected user quota as the file quota when setting the file as a target of the management based on the file quota.

5. The server apparatus according to claim 1, wherein the first server apparatus

determines whether a capacity of the file exceeds the threshold based on the file quota due to an update based on an update request when receiving the update request to a file stored in the first storage from the client apparatus, and again collects the user quota of users who use the file and adds the user quota to the file quota if the threshold is exceeded.

6. The server apparatus according to claim 1, wherein the first server apparatus

returns a file quota supplied by a user to the user quota of the user when access frequency to a file that is a target of the management based on the file quota by the user who supplies the user quota for the file is equal to or smaller than a preset threshold.

7. The server apparatus according to claim 1, wherein the first server apparatus

collects the user quota from a user and adds the user quota to the file quota of a file when access frequency to the file that is a target of the management based on the file quota by the user who does not supply the user quota for the file exceeds a preset threshold.

8. The server apparatus according to claim 1, wherein the first server apparatus

opens a file and increments a reference counter of the file when receiving an open request to the file stored in the first storage from the client apparatus;

closes a file and decrements a reference counter of the file when receiving a close request to the file stored in the first storage from the client apparatus; and

stubs a file by deleting only entity of the file from the first storage apparatus and leaving only metadata of the file in a case where the reference counter of the file stored in the first storage takes a value of 0 after the file is closed in response to receiving the close request to the file from the client apparatus, and where the file is used by only its owner.

9. The server apparatus according to claim 1, wherein the first server apparatus

transfers data of a file to the second storage apparatus via the second server apparatus and sets the file as a target of management by replication when a replication request is generated to the file stored in the first storage apparatus;

and

stubs the file by deleting only entity of a file from the first storage apparatus and leaving only metadata of the file when the first server apparatus migrates the file to the second storage apparatus, the file being a target of the management by the replication and the target of migration in the management based on the user quota.

10. The server apparatus according to claim 9, wherein the first server apparatus

manages information indicating that synchronization processing is required to match contents of files for files that are targets of the management by the replication, when there is an unmatched content between the data of a file stored in the first storage apparatus and the data of a file stored in the second storage apparatus;

and

excludes a file from a target of the migration, the file specified as requiring the synchronization processing according to the information.

11. A control method of a server apparatus that is a first server apparatus communicatively coupled to a client apparatus, a first storage apparatus, and a second server apparatus that is communicatively coupled to a second storage apparatus, wherein the first server apparatus

performs writing or reading of data of a file stored in the first storage apparatus, when receiving an access request to a file from the client apparatus;

manages a user quota that is information defining a limit of a used amount of storage resources by each user;

performs management based on the user quota where a file owned by a user is set as a target of migration to the second storage apparatus when the used amount of the user exceeds a threshold based on the user quota;

excludes a file, out of the files specified as targets of migration, used by a plurality of users from a target of the management based on the user quota, and sets the file as a target of management based on a file quota that is information defining a limit of capacity for each file, the file quota being the user quota supplied from the plurality of users who use the file; and

excludes the file from a target of the management based on the file quota, and sets the file as a target of the management based on the user quota when a capacity of a file set as a target of the management based on the file quota exceeds a threshold based on the file quota.

12. The control method of the server apparatus according to claim 11, wherein the first server apparatus

collects a user quota from each of users who use the file according to access frequency to the file by the user, and sets the collected user quota as the file quota when setting the file as a target of the management based on the file quota.

13. The control method of the server apparatus according to claim 11, wherein the first server apparatus

collects a user quota from each of users who use the file, evenly or according to access frequency to the file by the user, and sets the collected user quota as the file quota when setting the file as a target of the management based on the file quota.

14. The control method of the server apparatus according to claim 11, wherein the first server apparatus

determines whether a capacity of the file exceeds the threshold based on the file quota due to an update based on an update request when receiving the update request to a file stored in the first storage from the client apparatus, and again collects the user quota of users who use the file and adds the user quota to the file quota if the threshold is exceeded.

15. The control method of the server apparatus according to claim 11, wherein the first server apparatus

returns a file quota supplied by a user to the user quota of the user when access frequency to a file that is a target of the management based on the file quota by the user who supplies the user quota for the file is equal to or smaller than a preset threshold.