Irrecoverable error - but zpool status -v is clear. Curious!

Stilez

Guru
Joined
Apr 8, 2016
Messages
529
I always understood that if you got an error in the zpool status hearder for a pool, there'd usually be a numeric indication of the issue that it couldn't correct.

But it seems not. Probably ignorable but I'm curious - how to diagnose!

# zpool status -v My_pool
pool: My_pool
state: ONLINE
status: One or more devices has experienced an unrecoverable error. An
attempt was made to correct the error. Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
using 'zpool clear' or replace the device with 'zpool replace'.
see: https://zfsonlinux.org/msg/ZFS-8000-9P
scan: resilvered 3.06T in 0 days 19:29:38 with 0 errors on Fri Aug 7 22:05:18 2020
config:

NAME STATE READ WRITE CKSUM
My_pool ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
da0p2 ONLINE 0 0 0
da1p2 ONLINE 0 0 0
da4p2 ONLINE 0 0 5
mirror-1 ONLINE 0 0 0
da3p2 ONLINE 0 0 0
da7p2 ONLINE 0 0 0
da12p2 ONLINE 0 0 0
mirror-2 ONLINE 0 0 0
da11p2 ONLINE 0 0 0
da13p2 ONLINE 0 0 0
da6p2 ONLINE 0 0 0
mirror-3 ONLINE 0 0 0
da8p2 ONLINE 0 0 0
da9p2 ONLINE 0 0 0
da2p2 ONLINE 0 0 0
special
mirror-5 ONLINE 0 0 0
nvd0p1 ONLINE 0 0 0
nvd1p1 ONLINE 0 0 0
logs
mirror-4 ONLINE 0 0 0
nvd0p2 ONLINE 0 0 0
nvd1p2 ONLINE 0 0 0

errors: No known data errors



All nice and showing "0 - 0 - 0".

zpool events is empty.
SMARTCTL short test and log view on every disk in the pool (including nvd/nvme) shows health OK, no irrecoverable errors, no incomplete tests.

How does ZFS conclude theres a problem, and Im curious, before I clear the error, where would I find it?
 

Samuel Tai

Never underestimate your own stupidity
Moderator
Joined
Apr 24, 2020
Messages
5,398
Actually, if you look carefully, da4p2 is showing 5 checksum errors. Your mirror-0 vdev is fine, since there were 2 other disks in the vdev with clean checksums, so your pool overall is fine. Try scrubbing this pool to see if the other members of mirror-0 can correct the erroneous checksums in da4.
 

Stilez

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Joined
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