IO-stream adaptive write caching policy adjustment

Details IO-stream adaptive write caching policy adjustment IO-stream adaptive write caching policy adjustment

2008-05-27

2008-05-27

Ellis, Kevin L (Department: 2188)

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

Reexamination Certificate

active

11181837

ABSTRACT:
A method for performing adaptive write caching in a storage virtualization subsystem is disclosed. In this method, criteria associated with an operation state of the storage virtualizalion subsystem for performing write caching are first defined. Then, the characteristics of a stream of at least one write input/output (IO) request sent out by a host entity are analyzed to make a determination of whether the stream meets the criteria. Thereafter, a new write IO request by the subsystem from the host entity is received, and write caching is performed to write data associated with the new write IO request to a physical storage device (PSD) array according to the determination.

REFERENCES:
patent: 4536836 (1985-08-01), Dodd et al.
patent: 6192432 (2001-02-01), Slivka et al.
patent: 6427184 (2002-07-01), Kaneko et al.
patent: 2002/0156972 (2002-10-01), McKnight et al.
patent: 2003/0097524 (2003-05-01), Brant et al.

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