Balancing resiliency and performance by selective use of degraded writes and spare capacity in storage systems
US11301162B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2020 |
| Grant date | Apr 12, 2022 |
| Priority date | — |
| Expiry date | Jul 9, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2056
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Techniques are provided for processing user input/output (I/O) write requests in a fault-tolerant data storage system (e.g., a RAID storage system) by selecting between performing a degraded write operation or a write operation to spare capacity, when the fault-tolerant data storage system is operating in a degraded mode. A method includes receiving a user I/O write request comprising data to be written to a RAID array operating in a degraded mode, and determining whether spare capacity has been allocated for rebuilding missing data of an inaccessible storage device of the RAID array and whether a missing data block, which is associated with I/O write request, has been rebuilt to the spare capacity. A degraded write operation is performed without using the spare capacity, when the missing data block, which is associated with the data of the I/O write request, has not been rebuilt to the allocated spare capacity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.