fsck

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fsck

1. <operating system> file system check. The Unix program that checks a file system for internal consistency and bad blocks etc. and can repair some faults.

fsck is often used after a crash when the file system has been left in an inconsistent state, e.g. due to incomplete flushing of buffers.

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As a result, they require time-consuming, off-line assistance (e.g., the fsck utility) before a file system can be safely used after any system failure.

One can run the fsck utility on the file system, when it is convenient to have file system downtime, to reclaim unreferenced resources, and correct link counts.

By not requiring that the fsck utility be run on the file system after a crash, soft updates reduces file system recovery time by more than two orders of magnitude (see Section 4.4).