Method and system for browsing objects on a protected volume in a continuous data protection system

• US 7,720,817 B2
• Filed: 02/04/2005
• Issued: 05/18/2010
• Est. Priority Date: 02/04/2004
• Status: Active Grant

• Current Assignee: NetApp, Inc.
• Original Assignee: NetApp, Inc.
• Inventors: Chang, Yafen Peggy, Johnston, Craig Anthony, Trimmer, Donald Alvin, Stager, Roger Keith, Saxena, Pawan, Blaser, Rico
• Primary Examiner(s): Fleurantin; Jean B.
• Assistant Examiner(s): Jami; Hares
• Application Number:
  US11/051,792
• Publication Number:
  US 20050182953A1
• Time in Patent Office: 1,929 Days
• Field of Search: 707/1, 707/100, 707/102, 707/104, 707/200, 707/202, 707/204, 714/1, 714/15
• US Class Current: 707/649
• CPC Class Codes: G06F 11/1435 using file system or storage system metadata
• CPC Class Codes: G06F 11/1446 Point-in-time backing up or restoration of persistent data
• CPC Class Codes: G06F 11/2071 using a plurality of controllers
• CPC Class Codes: G06F 2201/84 Using snapshots, i.e. a logical point-in-time copy of the data
• CPC Class Codes: G06F 2201/855 Details of asynchronous mirroring using a journal to transfer not-yet-mirrored changes
• CPC Class Codes: Y10S 707/99953 Recoverability
• CPC Class Codes: Y10S 707/99955 Archiving or backup

Abstract

A method for browsing objects on a protected volume in a continuous data protection system begins by displaying a list of top-level objects to a user who selects a top-level object to browse. A snapshot is selected from the selected top-level object and is decoded. A list of objects in the selected snapshot is displayed and the user selects an object to browse. The selected object is decoded and operations are performed on the selected object. The user can browse the protected volume by snapshots in the top-level object or by a range of time of coverage of the top-level object.

Claims

1. A method for browsing objects on a protected volume in a continuous data protection system, comprising the steps of:

(a) displaying a list of top-level objects on the protected volume to a user;

(b) presenting to the user a top-level object on the protected volume to browse;

(c) providing the user a first browsing option and a second browsing option for browsing the top-level object, wherein;

(i) the first browsing option provides a list of snapshots of the top-level object, enabling the user to select a desired snapshot from the list of snapshots;

(ii) the second browsing option provides a list of range of times, each range of time indicating a start-time and an end-time between which the selected top-level object was protected, wherein, upon the user selecting a particular range of time from the list of range of times, the second browsing option provides, a list of snapshots of the top-level object corresponding to the particular range of time, enabling the user to select a desired snapshot from the list of snapshots corresponding to the particular range of time; and

(d) decoding the desired snapshot and displaying a list of objects corresponding to the desired snapshot;

(e) verifying that the selected snapshot is self-consistent, wherein if the selected snapshot is not self-consistent, then determining if the selected snapshot contains an application journal, and wherein if the selected snapshot contains an application journal, then using the application journal to adjust the selected snapshot in time until it is self-consistent;

wherein if the selected snapshot does not contain an application journal, then presenting a warning to the user that the snapshot is not self-consistent;

(f) enabling the user to select a particular object from the list of objects;

(g) decoding the particular object; and

(h) performing operations on the particular object.

2. The method according to claim 1, further comprising:

enabling the user to dynamically change the desired snapshot, wherein the desired snapshot is dynamically decoded to display a corresponding list of objects.

3. The method according to claim 1, wherein the step of decoding the particular object further comprises:

determining if the selected object is a parent object; and

displaying a next level of objects if the selected object is a parent object.

4. The method according to claim 1, wherein the step of performing operations on the particular object includes reading the contents of the selected object.

5. The method according to claim 1, wherein the step of performing operations on the particular object includes recovering the selected object.

6. The method according to claim 1, wherein the step of performing operations on the particular object includes using the selected object to interact with another application.

7. A system for browsing objects on a protected volume in a continuous data protection system, the system comprising:

a processor to execute a set of instructions to enable browsing of objects in the continuous data protection system, the set of instructions including;

a display means for displaying a list of objects on the protected volume to a user to browse, wherein the display means presents a top-level object for the user to browse, the top-level object having a first browsing means and a second browsing means, such that;

the first browsing means enables the user to select a desired snapshot from a list of snapshots corresponding to the top-level object; and

the second browsing means enables the user to select a desired time range from a list of time ranges, each time range indicating a start-time and an end-time between which the top-level object was protected, wherein, upon the user selecting a particular time range from the list of time ranges, the second browsing means provides a list of snapshots of the top-level object, enabling the user to select a desired snapshot from the list of snapshots corresponding to the particular time range;

a selecting means for selecting the desired snapshot;

a decoding means for decoding the desired snapshot and displaying a list of objects corresponding to the desired snapshot;

a verifying means for verifying that the desired snapshot is self-consistent, wherein if the desired snapshot is not self-consistent, then determining if the desired snapshot contains an application journal, and wherein if the desired snapshot contains an application journal, then using the application journal to adjust the desired snapshot in time until it is self-consistent;

wherein if the selected snapshot does not contain an application journal, then presenting a warning to the user that the snapshot is not self-consistent and that the snapshot does not contain an application journal;

an enabling means for enabling the user to select a particular object from the list of objects;

a decoding means for decoding the particular object;

an operations means for performing operations on the particular object; and

a storage memory to store the set of instructions for execution by the processor.

8. The system according to claim 7, wherein

said selecting means is used by the user to select a top-level object;

said decoding means decodes the selected top-level object;

said decoding means decodes a snapshot corresponding to the selected point in time;

said display means displays a list of objects in the decoded snapshot;

said selecting means is used by the user to select an object in the decoded snapshot;

said decoding means decodes the selected object; and

said performing means performs an action on the selected object.

9. The system according to claim 7, wherein

said selecting means is used by the user to dynamically change the selected point in time;

said decoding means decodes a second snapshot corresponding to the newly selected point in time; and

said display means displays a list of objects in the decoded second snapshot, whereby the displayed list of objects dynamically changes according to the newly selected time.

10. The system according to claim 7, wherein said performing means reads the contents of the selected object.

11. The system according to claim 7, wherein said performing means recovers the selected object.

12. The system according to claim 7, wherein said performing means uses the selected object to interact with another application.