I've read some stuff that says that Btrfs fsck is run every time on bootup. Is this still true? If so how can you tell when it runs or does not run on bootup? I just installed Ubuntu Raring Ringtail with Btrfs.
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Never heard of such a thing. Why should it do that? – MadMike Oct 11 '13 at 04:59
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Not sure what you are reading, but if a fsck is run, you'll know it. – psusi Oct 11 '13 at 22:47
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Btrfs FAQ: "Traditional filesystems need to run their respective fsck utility in case the filesystem was not unmounted cleanly and the log needs to be replayed before mount. This is not needed for btrfs. You should set fs_passno to 0. // Note, if the fsck.btrfs utility is in fact btrfsck, then the filesystem is unnecessarily checked upon every boot and slows down the whole operation. It is safe to and recommended to turn fsck.btrfs into a no-op, eg. by cp /bin/true /sbin/fsck.btrfs." – ignis Nov 03 '13 at 10:50