Storage system, and control method and program thereof

Details Storage system, and control method and program thereof Storage system, and control method and program thereof

2008-01-15

2008-01-15

Peugh, Brian R. (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

C707S793000

Reexamination Certificate

active

07320055

ABSTRACT:
A cache processing unit manages the data, which is in a cache memory, in a page unit including plurality pieces of block data each of which serves as an access unit of a host, and processes input and output requests from a host to a storage device. In a case in which dirty data in a cache memory which is updated by a host and newer than stored data in a storage device is to be written back to the storage device, and when an incontinuous area is determined in a page of the dirty data, a write-back process unit reads out an incontinuous area from a storage device when a read command is issued, subjects it to a merge so as to generate a continuous area, and performs a write back by one time of write command issue.

REFERENCES:
patent: 6397309 (2002-05-01), Kedem et al.
patent: 6529995 (2003-03-01), Shepherd
patent: 2001/0002480 (2001-05-01), Dekoning et al.
patent: 2001/0042222 (2001-11-01), Kedem et al.
patent: 2000-182292 (2000-06-01), None
patent: 2002-92880 (2002-03-01), None

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