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I don't know if I agree with this. For example - when you run fsck it attempts to repair nodes and fix missing/deleted files. I don't think these things can happen while the FS is mounted.
– Natalie Adams
Commented Jan 9, 2013 at 17:18
Different filesystems are different. ZFS is an example of a filesystem that does indeed verify and repair the filesystem online while it is mounted; it calls this scrubbing.
– Celada
Commented Jan 9, 2013 at 19:02

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