| 摘要 |
PROBLEM TO BE SOLVED: To improve the processing performance of a memory control unit with a write cache. SOLUTION: This memory control unit 200 is provided with a non-volatile cache 2400 interposed between plural disk devices 3000 and a host computer 1000 for temporarily holding read data/write data transferred between them. The binary management of the management information of user data on the cache 2400 is operated in an in-cache management information area 2420 in the cache 2400 and an in-local memory management information area 2221 in a volatile local memory 2210 capable of high speed access, and reference to the management information in a normal time is executed from the high speed in-local memory management information area 2221, and the management information is restored from the non-volatile in-cache management information area 2420 to the in-local memory management information area 2221 when any failure is generated. Thus, it is possible to quicken the access processing to the cache 2400 without deteriorating reliability. |
