| 摘要 |
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.
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