Dual channel restoration of data between primary and backup servers

Patent 7434093 Issued on October 7, 2008. Estimated Expiration Date:

May 16, 2025. 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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Inventor

Ohran, Richard S.

Assignee

EMC Corporation

Application

No. 11129858 filed on 05/16/2005

US Classes:

714/6Redundant stored data accessed (e.g., duplicated data, error correction coded data, or other parity-type data)

Examiners

Primary: Chu, Gabriel L.

Attorney, Agent or Firm

Workman Nydegger

Foreign Patent References

01991261.7 - 2224 EP 05/01/2008
03-241441 JP 10/01/1991
07-262068 JP 10/01/1995
09-305467 JP 11/01/1997
WO 97/24668 WO 07/01/1997

International Class

G06F 11/00

Abstract

Data blocks lost at a primary mass storage are restored while allowing the primary computer system to access the lost data block before full restoration. Restoration occurs along two channels. In the first channel, read requests issued by the primary computer system are handled by obtaining the requested data block from the backup mass storage device. The retrieved data block is then written to the primary mass storage, thereby restoring the primary mass storage for that data block. In the second channel of restoration, a snapshot copy of a selected data set of the backup mass storage is made and transported to the primary system. If the corresponding data block in the primary mass storage has a current data block, the data block is not written from the snapshot copy to the primary mass storage. Otherwise, the data block is copied from the snapshot copy to the primary mass storage.

Other References

Sale of Veritas File System (VxFS) Software, circa 1992, sold by Veritas Software Corporation.
Veritas Software Corp., Veritas File System (VxFS) System Administrator's Guide, circa Feb. 1992, author unknown.
IBM Corp., IBM Technical Disclosure Bulletin, Storage Management Mechanism for Managing Snapshot Pages, pp. 26-29, Sep. 1992, author unknonwn.