Switching roles between a production storage device and a...

Details Switching roles between a production storage device and a... Switching roles between a production storage device and a...

2006-09-27

2009-12-22

Elmore, Reba I (Department: 2189)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S154000, C711S163000

Reexamination Certificate

active

07636823

ABSTRACT:
A snapshot manager switches the roles of a production storage device and a corresponding snapshot device by modifying read and write requests to the devices. Thus, translation mapping information concerning the acting snapshot device does not change, so a remote computing device can perform a backup from the acting snapshot without having to restart every time content is written to the production device. After the backup operation, the snapshot manager can update the underlying data source from the acting production device to capture writes to production that occurred during the backup. The snapshot manager then reverts the roles of the storage device and the snapshot to normal.

REFERENCES:
patent: 6076148 (2000-06-01), Kedem
patent: 6792518 (2004-09-01), Armangau et al.
patent: 6820099 (2004-11-01), Huber et al.
patent: 7433903 (2008-10-01), Shapiro et al.
patent: 2005/0223180 (2005-10-01), Derbeko
patent: 2006/0212481 (2006-09-01), Stacey et al.

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