Backup method, backup system, disk controller and backup...

Details Backup method, backup system, disk controller and backup... Backup method, backup system, disk controller and backup...

2007-03-20

2007-03-20

Decady, Albert (Department: 2138)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Error detection for synchronization control

C714S770000

Reexamination Certificate

active

10910580

ABSTRACT:
A backup system includes a first storage device having first storage areas in which an update log of recorded data is stored; a second storage device having second storage areas which are paired with the first storage areas respectively and in which a copy of the update log is stored; and a disk controller. The state of a pair of first and second storage areas is changed from a non-pair state in which the update log is not stored in the pair of first and second storage areas to a pair state. The state of another pair of first and second storage areas is changed from a pair state to a non-pair state. The disk controller includes first and second disk controllers for controlling the first and second storage devices, respectively. The changes of pair
on-pair states are executed by the first disk controller.

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