Checksum error in mail but not in UI

[Jamberry]

I have received a mail with a checksum error:

Checking status of zfs pools:
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
Backup 7.25T 3.86T 3.39T - 12% 53% 1.00x ONLINE /mnt
freenas-boot 28.2G 2.46G 25.8G - - 8% 1.00x ONLINE -

pool: Backup
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: http://illumos.org/msg/ZFS-8000-9P
scan: scrub repaired 0 in 0 days 09:19:24 with 0 errors on Tue May 29 21:32:45 2018
config:

NAME STATE READ WRITE CKSUM
Backup ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
gptid/d4125293-d994-11e7-8c98-4ccc6aff3289 ONLINE 0 0 1
gptid/c956737b-2da9-11e8-ade8-4ccc6aff3289 ONLINE 0 0 0


The strange thing is, that if I look in the UI there is no CKSUM error.

Any idea which one is right? UI or mail?

 

[Ericloewe]

Did you reboot in between those two points in time? Those counters are not persistent.

 

[Jamberry]

Did you reboot in between those two points in time? Those counters are not persistent.

Yes I did because of the U5 Update. Ok, then I will ignore the error and see if it shows up again.

 

[Ericloewe]

Well, you shouldn't ignore that, you should make sure your disks aren't throwing SMART errors around.