Wear-balancing across storage devices based on endurance measurement
US12197740B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 14, 2022 |
| Grant date | Jan 14, 2025 |
| Priority date | — |
| Expiry date | Oct 15, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0679
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A storage system calculates relative writability of SSDs and biases storage of data from write IOs to the SSD that has the greatest relative writability, where writability is a value calculated as a function of remaining wear-life and drive capacity. When the remaining wear-life of an SSD falls below a threshold, unstable data is evicted from that drive, where data stability is an indication of likelihood of data being changed. The drive with the greatest relative writability is selected as the target for the unstable data. The drive with the greatest relative writability is also selected as the donor for stable data that is moved to the free space created by eviction of the unstable data. Consequently, the SSD that triggers the low wear-life threshold processes fewer write IOs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.