Targetless snapshots
US9965216B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2014 |
| Grant date | May 8, 2018 |
| Priority date | — |
| Expiry date | May 10, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1458
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Providing snapshots for a logical device includes maintaining a global sequence number for the logical device, providing a snapshot table having a plurality of entries, where each of the entries corresponds to a targetless snapshot and includes a sequence number associated with a particular one of the targetless snapshots, the sequence number corresponding to the global sequence number at a time each of the snapshots is created, and, if a sequence number associated with a specific portion of the logical device is less than the global sequence number, then prior to moving new data to a specific portion of the logical device, copying old data from the specific portion to a location in a pool device, setting a pointer in a replication data pointer table to point to the location in the pool device and setting the sequence number associated with the specific portion to equal the global sequence number.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.