Garbage collection and defragmentation for solid state drives (SSD) and shingled magnetic recording (SMR) drives
US9734051B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 2015 |
| Grant date | Aug 15, 2017 |
| Priority date | — |
| Expiry date | Mar 29, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D10/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Example apparatus and methods provide improved reclamation, garbage collection (GC) and defragmentation (defrag) for data storage devices including solid state drives (SSD) or shingled magnetic recording (SMR) drives. An erasure code (EC) layer that facilitates logically or physically erasing data from the SSD or SMR as a comprehensive GC or defrag is added to the SSD or SMR. Erased data may be selectively recreated from the EC layer as needed. Pre-planned EC write zones may be established to further optimize GC and defrag. Recreated data may be written to selected locations to further optimize SSD and SMR performance. Erasure code data may be distributed to co-operating devices to further improve GC or defrag. Example apparatus and methods may also facilitate writing data to an SMR drive using tape or VTL applications or processes and providing a pseudo virtual tape library on the SMR drive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.