System for scheduling readahead operations if new request is within a proximity of N last read requests wherein N is dependent on independent activities
US5483641A · kind A · utility
73Cited by
11References
14Claims
0Family size
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Key dates
| Filing date | Dec 17, 1991 |
| Grant date | Jan 9, 1996 |
| Priority date | — |
| Expiry date | Dec 17, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An improved read ahead strategy that improves the performance of a disk array subsystem. The disk controller keeps track of the last n reads to the array. If a new read request is received that is adjacent to any of the last n reads, the controller performs a look ahead read because a sequential read may be in progress. The parameter n is preferably set comparable to or greater than the number of maximum independent activites being performed by the computer system. Therefore, in a multithread system, the controller performs a readahead if any one thread is doing a sequential read.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.