Le 08/12/2015 16:06, Marc MERLIN a écrit : > Howdy, > > Why would scrub need space and why would it cancel if there isn't enough of > it? > (kernel 4.3) > > /etc/cron.daily/btrfs-scrub: > btrfs scrub start -Bd /dev/mapper/cryptroot > scrub device /dev/mapper/cryptroot (id 1) done > scrub started at Mon Dec 7 01:35:08 2015 and finished after 258 seconds > total bytes scrubbed: 130.84GiB with 0 errors > btrfs scrub start -Bd /dev/mapper/pool1 > ERROR: scrubbing /dev/mapper/pool1 failed for device id 1 (No space left on device) > scrub device /dev/mapper/pool1 (id 1) canceled I can't be sure (not-a-dev), but one possibility that comes to mind is that if an error is detected writes must be done on the device. The repair might not be done in-place but with CoW and even if the error is not repaired by lack of redundancy IIRC each device tracks the number of errors detected so I assume this is written somewhere (system or metadata chunks most probably). Best regards, Lionel -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
