Redundancy check of transaction records in a file system log of a file server
US7631009B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 2007 |
| Grant date | Dec 8, 2009 |
| Priority date | — |
| Expiry date | Nov 14, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1004
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
To recover from partial writes of metadata transactions to a file system log, a redundancy check is added to each log record. Upon re-boot of the file server, the file system is recovered by finding the last valid record in the log, and then replaying records from the log into the on-disk file system. The replay is terminated prior to the last valid record upon reaching any record with a bad redundancy check. A “fsck” is performed on the file system prior to granting client access to the file system only if the log recovery was terminated prior to the last valid record upon reaching a record with a bad redundancy check and the position of the records in the log indicates that this record with a bad redundancy check could not have been written to the log concurrently with the last valid record.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.