Managing snapshots using messages

• US 20090070536A1
• Filed: 09/10/2007
• Published: 03/12/2009
• Est. Priority Date: 09/10/2007
• Status: Active Grant

• Current Assignee: NetApp, Inc.
• Original Assignee: Network Appliance Incorporated (NetApp, Inc.)
• Inventors: Nasre, Rupesh
• Granted Patent: US 7,694,095 B2
• Time in Patent Office: Days
• US Class Current: 711/162
• CPC Class Codes: G06F 11/1464 for networked environments
• CPC Class Codes: G06F 16/128 Details of file system snapshots on the file-level, e.g. snapshot creation, administration, deletion use of snapshots for error detection or correction G06F11/14, G06F11/16
• CPC Class Codes: G06F 2201/84 Using snapshots, i.e. a logical point-in-time copy of the data

Abstract

A method and apparatus for managing snapshots of a file system using messages. A snapshot is a restorable version of a file system created at a predetermined point in time. A message is a persistent data structure supported by a file server. A message may include one or more snapshots, attributes for the message, and/or access control information for the message. The attributes and access control information are applied to all snapshots in the message. The attributes in the message enable users to perform automatic event-based management of the snapshots in the message. The access control information in the message provides granular access control to the snapshots in the message.

Claims

1. A method for managing at least one point in time image (PITI) of a file system, comprising the steps of:

creating one or more PITIs of a file system, wherein each PITI is an image of the file system created at a predetermined point in time;

generating a message containing the one or more PITIS;

setting attributes for the message, wherein the attributes define an event-based trigger for managing the one or more PITIs in the message; and

setting access control information for the message, wherein the access control information controls access to the one or more PITIs included in the message to one or more selected users.

2. The method according to claim 1, wherein an attribute includes an operation to be performed on the message, a number of times the operation is to be performed, and an argument that indicates when the operation is first performed.

3. The method according to claim 1, wherein each message has at least one attribute.

4. The method according to claim 3, wherein each attribute defines an operation and argument set by a user.

5. The method according to claim 1, wherein the attributes permit automatic operations on the snapshots in the message without manual intervention.

6. The method according to claim 1, wherein the access control information is used to reduce a security threat to the one or more PITIs included in the message by restricting access to the one or more PITIs to the one or more selected users.

7. A method for providing access to a snapshot of a file system, comprising the steps of:

requesting a file server to create a message, the message including the snapshot;

creating the message at the file server;

storing the message at the file server; and

accessing the message by a client, whereby the client can access the snapshot in the message.

8. The method according to claim 7, wherein the message includes access control information to control access to the snapshot, whereby only authorized clients can access the snapshot.

9. The method according to claim 8, wherein the message includes more than one snapshot and the access control information is applicable to all snapshots in the message.

10. The method according to claim 7, wherein the message includes attributes applicable to the message, the attributes defining operations that can be performed on the message.

11. The method according to claim 10, wherein the attributes permit event-based management of the snapshot in the message.

12. The method according to claim 10, wherein an attribute includes an operation to be performed on the message, a number of times the operation is to be performed, and an argument that indicates when the operation is first performed.

13. The method according to claim 10, wherein the operations are performed on the message by the file server.

14. The method according to claim 7, wherein the message includes more than one snapshot and the client can access all of the snapshots in the message.

15. The method according to claim 7, wherein the requesting step is performed by a first client and the accessing step is performed by a second client, the first client being different from the second client.

16. The method according to claim 15, further comprising the step of:

informing the second client by the first client that the message is stored on the file server, including providing a location of the message on the file server such that the second client can access the message.

17. The method according to claim 15, further comprising the step of:

sending an acknowledgement from the second client to the first client that the second client has accessed the message.

18. A computer-readable storage medium storing a set of instructions for execution by a general purpose computer to provide access to a snapshot of a file system, the set of instructions comprising:

a requesting code segment for requesting a file server to create a message, the message including the snapshot;

a creating code segment for creating the message at the file server;

a storing code segment for storing the message at the file server; and

an accessing code segment for accessing the message by a client, whereby the client can access the snapshot in the message.

19. A system for providing access to a snapshot of a file system, comprising:

a first client;

a file server including the file system, said file server in communication with said first client;

a second client in communication with said first client and said file server;

wherein;

said first client is configured to request said file server to create a message containing the snapshot;

said file server is configured to create the message and store the message;

said first client is further configured to inform said second client that the message is stored on said file server, including providing a location of the message on said file server such that said second client can access the message; and

said second client is configured to access the message, whereby said second client can access the snapshot in the message.

20. The system according to claim 19, wherein the message includes access control information to control access to the snapshot, whereby said second client can access the snapshot only if permitted by the access control information.

21. A method for controlling access to a snapshot of a file system associated with a first client and restored by a second client, the method comprising:

requesting a file server to create a message by the first client;

creating the message by the file server, wherein the message includes at least one snapshot of the file system, attributes that define an event-based trigger for managing the message, and access control information for defining policies that control access to the message;

providing a file path of the message to the second client;

granting the second client access to the message according to the access control information in the message; and

determining whether the attributes in the message require an action on the message by the file server.

22. The method according to claim 21, wherein the creating step includes determining whether additional snapshots need to be added to the message, the determining being made by a user creating the message.

23. The method according to claim 22, wherein all snapshots contained within the message are related.

24. The method according to claim 21, wherein the attributes and access control information for the message are applicable to all snapshots contained within the message.

25. The method according to claim 21, wherein each message has at least one attribute.

26. The method according to claim 25, wherein each attribute defines an operation and argument set by a user.

27. The method according to claim 21, wherein the attributes permit automatic operations on the snapshots in the message without manual intervention.

28. The method according to claim 21, wherein the access control information enables a user to define access control for a specific group of users.

29. The method according to claim 21, wherein the file path of the message is manually provided to a user of the second client.

30. The method according to claim 21, wherein the file server grants access to the message according to the credentials of the second client.

31. A file server configured to control access to a snapshot of a file system, comprising:

the file system; and

a processor configured to;

create a snapshot of the file system, wherein the snapshot is a restorable version of the file system created at a predetermined point in time;

generate a message containing the snapshot; and

set attributes and access control information for the message, wherein the attributes define an event-based trigger for managing the snapshots in the message and the access control information defines policies that control access to the snapshot in the message.

32. The file server according to claim 31, wherein a user issues a command to the file server to create the snapshot.

33. The file server according to claim 31, wherein the processor is further configured to determine whether additional snapshots need to be added to the message, the determination being made by a user creating the message.

34. The file server according to claim 33, wherein all snapshots contained within the message are related.

35. The file server according to claim 33, wherein the attributes and access control information for the message are applicable to all snapshots contained within the message.

36. The file server according to claim 31, wherein the message has at least one attribute.

37. The file server according to claim 36, wherein each attribute defines an operation and argument set by a user.

38. The file server according to claim 31, wherein the attributes permit automatic operations on the snapshot in the message without manual intervention.

39. The file server according to claim 31, wherein the access control information enables a user to define access control for a specific group of users.