Read priority caching system and method
US6968437B2 · kind B2 · utility
0Cited by
5References
21Claims
0Family size
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Key dates
| Filing date | Apr 16, 2003 |
| Grant date | Nov 22, 2005 |
| Priority date | — |
| Expiry date | Feb 17, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/0866
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Expected access times (EATs) of write request to a disk drive are essentially a measure of the predicted service time for the write request. Write Requests generated by a caching storage controller to a disk drive are essentially maintenance functions used to clear the cache. The disk drive modifies the EATs of write commands with a penalty such that read requests requiring disk access are preferentially satisfied. The penalty may be constant or may be established based on one or more factors, and may even be negative if necessary to clear a cache full of writes requiring destaging to disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.