Reduction of I/O latency for writable copy-on-write snapshot function
US8447943B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 24, 2010 |
| Grant date | May 21, 2013 |
| Priority date | — |
| Expiry date | Jan 15, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1458
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
According to one aspect of the invention, a method of controlling a storage system comprises storing data in a first volume in the storage system which has volumes including the first volume and a plurality of second volumes; prohibiting write I/O (input/output) access against the first volume after storing the data in the first volume; performing subsequent write requests received by the storage system against the second volumes in the storage system after storing the data in the first volume, each write request having a target volume which is one of the second volumes; and in response to each one write request of the write requests, determining whether the target volume of the one write request is write prohibited or not, and performing the one write request only if the target volume is not write prohibited.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.