RAID systems and methods for improved data recovery performance
US10877843B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2019 |
| Grant date | Dec 29, 2020 |
| Priority date | — |
| Expiry date | Aug 21, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1076
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A RAID system, RAID controller, method, and computer program product for reducing the number of reads of XOR data in a multi-storage-enclosure RAID array includes a RAID array controller that implements a selected distributed RAID scheme. The RAID array controller determines a set of drives and logical block addresses corresponding to a parity group and divides the set of drives into subsets of drives that are located within each individual storage enclosure of the multiple storage enclosures. The controller issues a single EnclosureXOR Read to each storage enclosure corresponding to the subsets of drives to read enclosure-level intermediate XOR data calculated by each storage enclosure for each subset of drives and in response to receiving the enclosure-level intermediate XOR data results from all storage drives in the parity group, and calculates an array level XOR result by XORing the enclosure-level intermediate XOR data results from the storage enclosures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.