Online snapshot consolidation using I/O mirroring
US10956041B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Oct 30, 2014 |
| Grant date | Mar 23, 2021 |
| Priority date | — |
| Expiry date | Nov 11, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0689
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
To create a backup of a live (running) virtual machine, a backup agent may take a snapshot of the virtual machine, backup the virtual machine from the snapshot disk, and delete the snapshot. Deleting the snapshot initiates a snapshot consolidation process where delta disks of the virtual machine are collapsed. A virtual disk layer sets up a mirror driver between a current virtual disk and a target virtual disk. Data sectors of the delta disk are copied over to the target virtual disk in a single pass, while the mirror driver mirrors write request for the current virtual disk to the target virtual disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.