Method and system for accessing data stored in data cache with fault tolerance
US10936412B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 2017 |
| Grant date | Mar 2, 2021 |
| Priority date | — |
| Expiry date | Nov 23, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/222
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
According to some embodiments, a backup storage system receives a request from a client to access a data segment. The system looks up an in-memory index for a first entry based on a fingerprint of the data segment, such that the in-memory index includes a number of entries, each entry mapping a fingerprint to a storage location of a solid state device (SSD) storing a corresponding data segment. In the event a first entry is found, the system retrieves the data segment from the SSD device based on the first entry. In the event of a read failure while accessing the SSD device, the system determines failed data blocks of the SSD device associated with the failure event and invalidates the failed data blocks of the SSD device such that subsequent access to the failed data blocks are denied without having to access a corresponding SSD device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.