Method and apparatus for performing point in time backup operation in a computer system

Patent 5857208 Issued on January 5, 1999. Estimated Expiration Date:

May 31, 2016. 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

Ofek, Yuval

Assignee

EMC Corporation

Application

No. 656036 filed on 05/31/1996

US Classes:

707/204, Archiving or backup707/202, Recoverability714/6Redundant stored data accessed (e.g., duplicated data, error correction coded data, or other parity-type data)

Examiners

Primary: Black, Thomas G.
Assistant: Rones, Charles

Attorney, Agent or Firm

Pearson & Pearson

International Class

G06F 017/30

Abstract

A data network with a remote data facility for providing redundant data storage and for enabling concurrent point-in-time backup operations. A local data processing system with a data facility stores a data base and processes applications. A second system, physically separated from the first system, includes a data facility that normally mirrors the data in the first system. In a backup mode, the second system is enabled to transfer data from its data facility to a backup facility concurrently with, but independently of, the operation of the first system. On completion of the backup operation, the second system reconnects with and synchronizes with the first system thereby to reestablish the mirroring operation of the second system.