Snapshot reconstruction from an existing snapshot and one or more modification logs

Patent 6981114 Issued on December 27, 2005. Estimated Expiration Date:

October 16, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

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Inventors

Assignee

VERITAS Operating Corporation

Application

No. 10271452 filed on 10/16/2002

US Classes:

711/162, Backup711/112, Direct access storage device (DASD)711/114, Arrayed (e.g., RAIDs)711/161, Archiving714/5, Of memory or peripheral subsystem707/201, Coherency (e.g., same view to multiple users)707/200, FILE OR DATABASE MAINTENANCE707/204, Archiving or backup382/305, Image storage or retrieval711/6Virtual machine memory addressing

Examiners

Primary: Nguyen, T.

Attorney, Agent or Firm

International Class

G06F012/16

Abstract

A deleted snapshot of a data volume may be reconstructed from an existing snapshot and one or more modification logs. For example, modifications to the data volume that occur subsequent to creation of a first snapshot may be logged in a modification log. If the first snapshot is deleted, the first snapshot may be reconstructed by modifying a second snapshot, created after the first snapshot, according to the modification log in order to undo any modifications made to the data volume prior to creation of the second snapshot and after creation of the first snapshot.