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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?
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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