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Astonishingly slow scrub
ReadyNAS Pro running OS 6.10.10 6 x 4TB Seagate IronWolf drives, RAID5 ClamAV disabled So this is something I've never seen before... I started a BTRFS scrub on December 26. It ran fine at ...
Are you seeing any errors in the log zip file?
Thanks for the suggestion, StephenB. The only errors I saw when I grepped the log files for "error" were a bunch of mail-server authentication errors in msmtp.log. But those aren't being generated unusually frequently or anything.
Root partition was 82% full because I'd thoughtlessly cloned a big git repo there. But I just deleted that directory and brought the usage back down to 38%. No change in btrfs scrub's behavior.
Oh wait a minute. Looks like the "82% full" messages I saw when I grepped for "warn" were the problem!
Scrub is now writing at 56 MB/sec, up from a few KB every few seconds.
Woohoo! Thanks, StephenB !
root@NAS3:~# btrfs scrub status /data
scrub status for 67868afa-d33f-4eaa-a77a-b7825ffc66e7
scrub started at Sat Dec 28 23:37:38 2024, running for 640:56:16
total bytes scrubbed: 975.44GiB with 0 errors
root@NAS3:~# btrfs scrub status /data
scrub status for 67868afa-d33f-4eaa-a77a-b7825ffc66e7
scrub started at Sat Dec 28 23:37:38 2024, running for 640:58:31
total bytes scrubbed: 982.71GiB with 0 errors
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