Data protection in a random access disk array
US8799705B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2012 |
| Grant date | Aug 5, 2014 |
| Priority date | — |
| Expiry date | Jan 29, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/262
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A disk array memory system comprises: a plurality of disks in a disk array for storage of content data and parity data in stripes, content data in a same stripe sharing parity bits of said parity data, each disk having a spare disk capacity including at least some of a predefined array spare capacity, said array spare capacity providing a dynamic space reserve over said array to permit data recovery following a disk failure event; a cache for caching content data prior to writing to said disk array; and a controller configured to select a stripe currently having a largest spare stripe capacity, for a current write operation of data from said cache, thereby to write all said data of said current write operation on a same stripe, thereby to maximize sharing of parity bits per write operation and minimize separate parity write operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.