On-SSD-copy techniques using copy-on-write
US12366986B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 2021 |
| Grant date | Jul 22, 2025 |
| Priority date | — |
| Expiry date | Apr 23, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/065
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
On-SSD-copy using Copy-On-Write (COW) techniques track indirection updates to the copied data without duplicating the data. In one example, a method involves receiving a copy command to copy data from a source LBA to a destination LBA. An entry in a logical-to-physical (L2P) table corresponding to the destination LBA is updated to refer to the same physical address as the source LBA's entry in the L2P table. Flags in the L2P table are updated to indicate that more than one LBA refers to the same physical address. After updating the L2P table and before copying the data, a token is stored to the storage device. After storing the token, but before copying the data, an acknowledgement can be sent to the host to indicate the copy command is complete. A subsequent write to either the source or destination LBAs trigger a copy of the data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.