Storage controller and storage control method
US7681002B2 · kind B2 · utility
3Cited by
8References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2007 |
| Grant date | Mar 16, 2010 |
| Priority date | — |
| Expiry date | Dec 26, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0689
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A storage control technique with which, even if not data, but only its management information is deleted, a host system can recognize storage areas storing unnecessary data and so use them effectively. When a file system in the host system deletes the management information for data stored in a page in a pool volume, a control circuit writes ‘0’ in all the areas in the deletion target page in response to a command from the host system. The control circuit then detects the page where ‘0’ is written in all of its areas and releases it from allocation to the corresponding virtual volume.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.