Subsystem and subsystem processing method

Details Subsystem and subsystem processing method Subsystem and subsystem processing method

2006-09-19

2006-09-19

Bataille, Pierre-Michel (Department: 2186)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S112000, C711S118000, C710S022000

Reexamination Certificate

active

07111134

ABSTRACT:
A subsystem and a subsystem processing method are disclosed in which a storage control unit2000interposed between a plurality of disk units3000and a host computer1000has a nonvolatile cache2400for temporarily holding the read data/write data exchanged between the disk units3000and the host computer1000. The management information for the user data in the cache2400is stored in both the in-cache management information area2420in the cache2400and the in-memory management information area2221in a volatile local memory2210accessible at high speed. Under normal conditions, the management information in the high speed in-memory management information area2221is accessed. At the time of a fault, on the other hand, the management information in the nonvolatile in-cache management information area2420is restored in the in-memory management information area2221, thereby improving the access rate of the cache2400.

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