Dasd I/O caching method and application including replacement policy minimizing data retrieval and storage costs
US5845318A · kind A · utility
11Cited by
13References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 28, 1996 |
| Grant date | Dec 1, 1998 |
| Priority date | — |
| Expiry date | Oct 28, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/121
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The performance of a DASD having a data cache and at least one set of R/W heads is improved by implementing a replacement policy which, upon determining that a request for data in the DASD requires replacement of a data in a data cache buffer, selects cache data corresponding to data which is cheapest to retrieve from the DASD in view of a location of the DASD R/W heads and replaces the selected cache data with the requested data, thus keeping the cache filled with data which is least expensive to retrieve from the DASD. Data in the DASD is updated from the cache when it is inexpensive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.