Hey. I've just noted the following behaviour: # btrfs scrub start -Bdr / scrub device /dev/sda2 (id 1) done scrub started at Sun Dec 27 01:59:05 2015 and finished after 00:04:04 total bytes scrubbed: 29.39GiB with 0 errors scrub device /dev/sdb2 (id 2) done scrub started at Sun Dec 27 01:59:05 2015 and finished after 00:04:08 total bytes scrubbed: 29.39GiB with 0 errors => that works as expected However: # btrfs scrub start -Bdr /dev/disk/by-label/system scrub device /dev/sdb2 (id 2) done scrub started at Sun Dec 27 01:53:18 2015 and finished after 00:04:01 total bytes scrubbed: 29.37GiB with 0 errors => seems to scan only sdb2 (which is where /dev/disk/by-label/system points to) at least, no output is given for sda2 Cheers, Chris.
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