Caching techniques duplicating dirty data in secondary cache
US10620850B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 2016 |
| Grant date | Apr 14, 2020 |
| Priority date | — |
| Expiry date | Mar 26, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/621
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Described are techniques for data caching. Dirty cached data of a first logical address may be stored in a secondary cache included in multiple caching layers. The multiple caching layers may also include a primary data cache. Two copies of the dirty cached data may be stored in two different cache pages on two different physical devices of the secondary cache. The two cache pages may be marked as dirty indicating that data stored in the cache pages of the secondary cache is a more recent copy of data stored at the first logical address than other data stored on first non-volatile physical storage. Clean cached data of a second logical address may also be stored in the secondary cache where a single copy of the clean cached data is stored in physical storage of the secondary cache.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.