Source cleaning cascaded volumes using reference counts
US9075535B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2013 |
| Grant date | Jul 7, 2015 |
| Priority date | — |
| Expiry date | Feb 25, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/84
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system, process, and product for source cleaning cascaded volumes include the ability to store a number of cascaded backup volumes and prepare received writes for storage. The system, process, and product also include the ability to examine a metadata set associated with a volume region for a write to determine whether another volume depends on the region and write the new data to the region if another volume is not dependent. The system, process, and product further include the ability to determine whether a write is for a volume region that is a canonical source and, if so, decrement a reference count in a metadata set associated with the region and establish the volume of the region as a canonical source for a metadata set associated with a new metadata set location identifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.