Data transfer control of virtual storage supported by three-level hierarchical storage
US5579507A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1993 |
| Grant date | Nov 26, 1996 |
| Priority date | — |
| Expiry date | Aug 5, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/08
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a storage control method for use in a computer system having a main storage, a first external storage, and a second external storage having an access speed higher than that of the first external storage, a check is made for a free area of the second external storage to decide a size of the free area. The size is compared with a predetermined first reference value. If the size is smaller, to prepare a free area having a size not less than the first reference value, the storage contents are transferred from the second external storage to the first external storage. If the free area size is larger than the first reference value, the size is next compared with a predetermined second reference value greater than the first reference value. If the size is larger than the first reference value and smaller than the second reference value, a predetermined amount of the storage contents are transferred from the second external storage to the first external storage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.