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RAID Scrub broken in 6.9.2?
Is anyone else having issues with RAID scrub seeming to go much slower and seemingly quit part of the way through with 6.9.2? 4-drive RAID5 here. I've started two scrubs now, they go even slower than...
The scrub happily finished this time. Go figure.
Update, scrub is reporting done at the command line but some sort of resync is still occurring by looking at top (md127_resync and md127_raid5 each taking up a CPU core). Frontview is saying scrub is still only 20% done. Going to see if the scrub job mysteriously disappears again from frontview. Thinking there might be some sort of frontview bug in 6.9.2.
root@[hostname scrubbed]:/var/log# btrfs scrub status /data
scrub status for d087569e-efd2-4262-bcf5-a2689bb38849
scrub started at Sun Jan 28 12:31:25 2018 and finished after 04:25:55
total bytes scrubbed: 4.54TiB with 0 errors
The GUI-initiated scrub performs both an mdadm (the software RAID) re-sync and a btrfs (the file system) scrub. The GUI shows thes both as a "scrub". Use cat /proc/mdstat to see if one of the volumes is still re-syncing or stuck trying to do so.
This is not new in 6.9.2, BTW.
It would be worth checking smart_history.log for recent changes in key SMART values.
All seems well with the disks (the RAID5 in question is the top 4 disks):
time model serial realloc_sect realloc_evnt spin_retry_cnt ioedc cmd_timeouts pending_sect uncorrectable_err ata_errors ------------------- -------------------- -------------------- ------------ ------------ -------------- ---------- ------------ ------------ ----------------- ---------- 2015-04-06 13:22:06 WDC WD4000F9YZ-09N20 [serialscrubbed] 0 0 0 -1 -1 0 0 0 2015-04-06 13:22:06 WDC WD4000F9YZ-09N20 [serialscrubbed] 0 0 0 -1 -1 0 0 0 2015-04-06 13:22:06 WDC WD4000F9YZ-09N20 [serialscrubbed] 0 0 0 -1 -1 0 0 0 2015-04-06 13:22:06 WDC WD4000F9YZ-09N20 [serialscrubbed] 0 0 0 -1 -1 0 0 0 2017-06-19 14:01:04 WDC WD40EFRX-68N32N0 [serialscrubbed] 0 0 0 -1 -1 0 0 0 2017-06-19 14:01:04 WDC WD40EFRX-68N32N0 [serialscrubbed] 0 0 0 -1 -1 0 0 0
The resync is 95% through. I'll let you all know if it mysteriously disappears again.
The scrub happily finished this time. Go figure.
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