Storage system, storage subsystem and storage control method

Details Storage system, storage subsystem and storage control method Storage system, storage subsystem and storage control method

2011-07-19

2011-07-19

Lane, Jack A (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

C711S144000, C711S145000, C711S162000, C711S165000

Reexamination Certificate

active

07984245

ABSTRACT:
Proposed is a storage system capable of preventing the compression of a cache memory caused by data remaining in a cache memory of a storage subsystem without being transferred to a storage area of an external storage, and maintaining favorable I/O processing performance of the storage subsystem. In this storage system where an external storage is connected to the storage subsystem and the storage subsystem provides a storage area of the external storage as its own storage area, provided is a volume for saving dirty data remaining in a cache memory of the storage subsystem without being transferred to the external volume. The storage system recognizes the compression of the cache memory, and eliminates the overload of the cache memory by saving dirty data in a save volume.

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