Data storage system and a method of storing data including a...

Details Data storage system and a method of storing data including a... Data storage system and a method of storing data including a...

2006-01-31

2006-01-31

Laxton, Gary L. (Department: 2188)

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

C711S113000, C711S117000, C711S118000, C711S162000, C711S165000, C711S202000

Reexamination Certificate

active

06993627

ABSTRACT:
A data storage system (100) and a method of storing data are described including a cache (118) with a variable number of levels (210, 220, 230, 240). Each level in the cache (118) has a cache controller (212, 222, 232, 242) and a cache memory (214, 224, 234, 244) for storing data. An address mapping is recorded and applied between each of the levels of the cache (118). The address mapping corresponds to a point in time virtual copy operation such as a snapshot copy operation applied to the cache (118) and enables point in time virtual copy operations to be carried out in electronic time. A new level is created in the cache (118) when a point in time virtual copy operation is received by the cache and a corresponding address mapping is applied to the previous level in the cache (118).

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J. Menon, “A Performance Comparison of RAID-5 and Log-Structured Arrays”, Proceedings of the Fourth IEEE International Symposium on High Performance Distributed Computing, 1995, pp. 167-178.

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