Storage controller and storage control method
US8180989B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2011 |
| Grant date | May 15, 2012 |
| Priority date | — |
| Expiry date | Feb 11, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0689
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A storage controller having a plurality of storage devices and a control circuit providing a plurality of virtual volumes, to each of which a storage area in a plurality of pool volumes provided with the plurality of storage devices can be mapped for writing data in response to a write access sent from an information processing apparatus to a logical area in one of the plurality of virtual volumes, respectively. The control circuit, according to a search of the plurality of pool volumes for a certain storage area in which a certain data pattern is written, releases the certain storage area from mapping to a logical area in the plurality of virtual volumes, so that the control circuit can use the released certain storage area for mapping to a virtual volume of the plurality of virtual volumes as a destination of another write access from the information processing apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.