High-speed snapshot method

Details High-speed snapshot method High-speed snapshot method

2008-01-29

2008-01-29

Bataille, Pierre-Michel (Department: 2186)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S170000, C711S167000

Reexamination Certificate

active

11454255

ABSTRACT:
When a snapshot of data is taken, it is after a write request comes from the host equipment that old data on the source-side magnetic disk to the snapshot-side magnetic disk; therefore, it takes a long time before new data is actually written in the source-side magnetic disk. To overcome this problem, by analyzing data update information, and from a result of analysis, by deciding an area that has high possibility of receiving a request to write data, and having data of that area previously copied to the snapshot-side magnetic disk, it is possible to take a snapshot very quickly.

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Dishon et al., “Disk Dual Copy Methods and Their Performance”, Eighteenth International Symposium on Fault-Tolerant Computing, IEEE Comput. Soc. Press 1988, pp. 314-319, Jun. 1988.
Microsoft Windows 2000 Server Operating System: Developing Hardware Snapshot Providers for Whistler (White Paper, Updated for Whistler Server Beta 3).

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