Remote copy system maintaining consistency

Details Remote copy system maintaining consistency Remote copy system maintaining consistency

2007-03-27

2007-03-27

Shah, Sanjiv (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S161000, C707S793000, C707S793000

Reexamination Certificate

active

10932102

ABSTRACT:
To provide a remote copy system including: a plurality of primary storage systems and a plurality of secondary storage systems; each of the secondary storage systems including a secondary logical volume that stores a copy of the data stored in a primary logical volume of the primary storage system; a pre-update data storage part that stores pre-update data that is stored before data to be stored in the secondary logical volume is updated and time stamps of the data to be stored in the secondary logical volume; pre-update data prior to a recovery time set based on the time stamps stored in the pre-update data storage part is obtained from the pre-update data storage part; and the pre-update data is written to the secondary logical volume in an inverse order of the time stamp with the latest time stamp first, to recover data of the secondary logical volume.

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