Update: The scrub back on 4.15 went as expected. I rebooted with 5.3
kernel and tried the scrub again. I saw the same behaviour: the scrub
started, with a very fast rate and short time estimate (3-5 minutes),
and then reached 100% after about that time. However it continued to say
it was in progress, despite saying 100.00% done. It did not calcualte a
time estimate, saying the rate was slow, however, it did complete after
3h36 (so fast than it used to on kernel 4.15).
eric@eric-8700K:~$ zpool status
pool: storagepool1
state: ONLINE
scan: scrub repaired 0B in 3h36m with 0 errors on Sat Jan 18 14:50:16 2020
config:
NAME STATE READ WRITE CKSUM
storagepool1 ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
ata-WDC_WD20EZRZ-00Z5HB0_WD-WCC4M3YFRVJ3 ONLINE 0 0 0
ata-ST2000DM001-1CH164_Z1E285A4 ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
ata-WDC_WD20EZRZ-00Z5HB0_WD-WCC4M1DSASHD ONLINE 0 0 0
ata-ST2000DM006-2DM164_Z4ZA3ENE ONLINE 0 0 0
errors: No known data errors
I started a scrub again to see whether it was just the first time with this
kernel, but again the % complete seems inaccurate, and the time remaining is
definitely inaccurate (0h0m shortly after starting).
So at the very least it is clear that zpool status is not accurately
reporting the scrub process on kernel 5.3.
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https://bugs.launchpad.net/bugs/1860182
Title:
zpool scrub malfunction after kernel upgrade
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