NVRAM data organization using self-describing entities for predictable recovery after power-loss
US9152330B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 2014 |
| Grant date | Oct 6, 2015 |
| Priority date | — |
| Expiry date | May 9, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2211/1038
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In one embodiment, a node coupled to a plurality of solid state drives (SSDs) executes a storage input/output (I/O) stack having a plurality of layers. Write data associated with one or more write requests to the SSDs is stored in a volatile log. The write data is organized into one or more extents that are copied to the SSDs. The volatile log has a front-end and a set of records with metadata. The metadata includes a head offset referencing an initial record and a tail offset referencing a final record. A portion of the one or more write requests including the write data is copied to a non-volatile log maintained in a non-volatile random access memory (NVRAM). The front-end and the set of records from the volatile log are copied, but the head offset and the tail offset are not, to reduce an amount of metadata copied to the NVRAM.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.