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The many, MANY days of scrubbing.
RN516 - OS 6.10.9 Intel XEON E3-1265L V2 @ 2.50GHz 16GB RAM 6 x 10 TB HGST HUH721010ALE601 disks in a RAID 6 So, I decided to do a little preventative maintenance on my RN516, LOL: ...
I suggest looking for disk errors in the logs.
You can check the progress with ssh (keeping in mind that the system is doing both a RAID mdadm scrub and a BTRFS scrub).
How big is the volume?
Hey there! The volume is 36.4TB (6x 10 TB disks in a RAID 6). I didn't see any SMART errors. What log do I find disk errors in?
I checked dmesg, and the last messages that I see are from the resync of md127, and that completed in a pretty reasonable amount of time:
[Fri Jun 7 02:23:13 2024] md: requested-resync of RAID array md127
[Fri Jun 7 02:23:13 2024] md: minimum _guaranteed_ speed: 30000 KB/sec/disk.
[Fri Jun 7 02:23:13 2024] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for requested-resync.
[Fri Jun 7 02:23:13 2024] md: using 128k window, over a total of 9761587136k.
[Mon Jun 10 20:04:40 2024] md: md127: requested-resync done.
There's nothing after that.
I checked the status of the btrfs scrub, and it's diligently ticking away, no major errors reported:
root@RN516:/home/admin# btrfs scrub status -R /dev/md127
scrub status for 3e0931f1-84c5-45a4-9db5-e1d7f61ce675
scrub started at Fri Jun 7 02:26:46 2024, running for 278:22:08
data_extents_scrubbed: 498981037
tree_extents_scrubbed: 2327562
data_bytes_scrubbed: 32294854987776
tree_bytes_scrubbed: 76269551616
read_errors: 0
csum_errors: 0
verify_errors: 0
no_csum: 1019
csum_discards: 0
super_errors: 0
malloc_errors: 0
uncorrectable_errors: 0
unverified_errors: 0
corrected_errors: 0
last_physical: 32481801666560
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