Hey. Just noted, mine says this: >Start a scrub on all devices of the filesystem identified by <path> >or on a single <device>. If a scrub is already running, the new one >fails. still not the text you quoted,... but there it is.
Anyway... it still contradicts the main description which implies that a scrub always scrubs everything,... so I'd still call that a documentation bug. Further,... - Eithr btrfs start allows multiple devices to be specified (which isn't documented either, - or it should allow that. - or using -d makes no sense when the scrub is launched on a device (instead of a mount point) and should thus fail or give at least a warning. Cheers, Chris.
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