Garbage collection in a storage system
US8886691B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 2013 |
| Grant date | Nov 11, 2014 |
| Priority date | — |
| Expiry date | Aug 30, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F16/1748
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system and method for performing garbage collection. A system includes a storage medium, a first table including entries which map a virtual address to locations in the storage medium, and a second table with entries which include a reverse mapping of a physical address in a data storage medium to one or more virtual addresses. A storage controller is configured to perform garbage collection. During garbage collection, the controller is configured to identify one or more entries in the second table which correspond to a segment to be garbage collected. In response to determining the first table includes a valid mapping for a virtual address included in an entry of the one of the one or more entries, the controller is configured to copy data from a first location identified in the entry to a second location in the data storage medium, and reclaim the first storage location.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.