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Do system panics or power outages ever corrupt UFS logging?

April 26, 2017corrupt logging outages panics power system ufs

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Do system panics or power outages ever corrupt UFS logging?

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After a panic or power outage, UFS logging “rolls” the log file forward, discarding any unfinished system calls in the log. Thus, the file system should never be in an irreparable state, no matter how much activity there was at the time of the panic or outage. In addition, fsck can tell if a file system is a logging file system, and not check it during the reboot. This can save quite a bit of time on large file systems when rebooting after a failure.