Drive extent based end of life detection and proactive copying in a mapped RAID (redundant array of independent disks) data storage system
US10459814B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 2017 |
| Grant date | Oct 29, 2019 |
| Priority date | — |
| Expiry date | Feb 10, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/3034
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Mapped RAID (Redundant Array of Independent Disks) technology divides individual drives into multiple drive extents, allocates the drive extents to RAID extent entries in a RAID mapping table, and performs “end of life” detection and proactive copying of data between data storage drives on a per drive extent basis. A given drive extent is determined to be “end of life” when the ratio of soft media errors to total I/O operations for the drive extent exceeds a threshold error ratio. Data stored on the drive extent is then proactively copied to a newly allocated drive extent, the RAID mapping table is modified so that the data is subsequently accessed from the newly allocated drive extent, and the drive extent is excluded from being used again to store host data. As a result, the rate at which the drives experience soft media errors is slowed, lengthening their effective life.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.