Caching source blocks of data for target blocks of data
US8825975B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2013 |
| Grant date | Sep 2, 2014 |
| Priority date | — |
| Expiry date | Feb 22, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/0868
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Provided is a method for processing a read operation for a target block of data. A read operation for the target block of data in target storage is received, wherein the target block of data is in an instant virtual copy relationship with a source block of data in source storage. It is determined that the target block of data in the target storage is not consistent with the source block of data in the source storage. The source block of data is retrieved. The data in the source block of data in the cache is synthesized to make the data appear to be retrieved from the target storage. The target block of data is marked as read from the source storage. In response to the read operation completing, the target block of data that was read from the source storage is demoted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.