Storage control unit with a volatile cache and a non-volatile backup cache for processing read and write requests
US6799244B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2002 |
| Grant date | Sep 28, 2004 |
| Priority date | — |
| Expiry date | Dec 6, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/20
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A subsystem and a subsystem processing method are disclosed in which a storage control unit 2000 interposed between a plurality of disk units 3000 and a host computer 1000 has a nonvolatile cache 2400 for temporarily holding the read data/write data exchanged between the disk units 3000 and the host computer 1000. The management information for the user data in the cache 2400 is stored in both the in-cache management information area 2420 in the cache 2400 and the in-memory management information area 2221 in a volatile local memory 2210 accessible at high speed. Under normal conditions, the management information in the high speed in-memory management information area 2221 is accessed. At the time of a fault, on the other hand, the management information in the nonvolatile in-cache management information area 2420 is restored in the in-memory management information area 2221, thereby improving the access rate of the cache 2400.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.