Drives appear ok, no smart errors, but mirror is degraded?

[k0d3g3ar]

Hi all, I’m seeing something really unusual. We recently were copying a very large amount of content from a backup server to our FreeNAS box, and after a few hours it failed. Then I got some error notifications and a degraded Raidz array.

I checked the physical HDDs and they were all fine. The drive in question didn’t fail any smart tests and appeared to be working. I used zpool clear to clear the error, which it did and returned the drive back to ONLINE status.

However I’m still seeing this in the Mirror section which is being reported to me each day:

Checking status of gmirror(8) devices:
Name Status Components
mirror/swap0 COMPLETE mfisyspd7p1 (ACTIVE)
mfisyspd6p1 (ACTIVE)
mirror/swap1 COMPLETE mfisyspd5p1 (ACTIVE)
mfisyspd4p1 (ACTIVE)
mirror/swap2 COMPLETE mfisyspd3p1 (ACTIVE)
mfisyspd2p1 (ACTIVE)
mirror/swap3 DEGRADED mfisyspd0p1 (ACTIVE)

-- End of daily output --

When I run zpool status -v I get this:


root@freenas:~ # zpool status -v
pool: Main
state: ONLINE
scan: resilvered 20K in 0 days 00:00:15 with 0 errors on Sun Apr 3 19:37:54 2022
config:

NAME STATE READ WRITE CKSUM
Main ONLINE 0 0 0
raidz2-0 ONLINE 0 0 0
gptid/d71f47be-0224-11ec-888b-ecf4bbc00518 ONLINE 0 0 0
gptid/d0b3f120-cfd2-11e7-8d06-ecf4bbc00518 ONLINE 0 0 0
gptid/d2077e13-cfd2-11e7-8d06-ecf4bbc00518 ONLINE 0 0 0
gptid/d31d68f2-cfd2-11e7-8d06-ecf4bbc00518 ONLINE 0 0 0
gptid/d42ef454-cfd2-11e7-8d06-ecf4bbc00518 ONLINE 0 0 0
gptid/d544f8e2-cfd2-11e7-8d06-ecf4bbc00518 ONLINE 0 0 0
gptid/d657a523-cfd2-11e7-8d06-ecf4bbc00518 ONLINE 0 0 0
gptid/d7776b20-cfd2-11e7-8d06-ecf4bbc00518 ONLINE 0 0 0

errors: No known data errors

pool: freenas-boot
state: ONLINE
scan: scrub repaired 0 in 0 days 00:01:39 with 0 errors on Mon Apr 4 03:46:39 2022
config:

NAME STATE READ WRITE CKSUM
freenas-boot ONLINE 0 0 0
da0p2 ONLINE 0 0 0

errors: No known data errors

Any ideas why this would show only in the case of a mirror, and is this indicative of something I need to do, or is there a way to clear this error in the mirrors?

Thanks
K

 

[sretalla]

Checking status of gmirror(8) devices:
Name Status Components
mirror/swap0 COMPLETE mfisyspd7p1 (ACTIVE)
mfisyspd6p1 (ACTIVE)
mirror/swap1 COMPLETE mfisyspd5p1 (ACTIVE)
mfisyspd4p1 (ACTIVE)
mirror/swap2 COMPLETE mfisyspd3p1 (ACTIVE)
mfisyspd2p1 (ACTIVE)
mirror/swap3 DEGRADED mfisyspd0p1 (ACTIVE)

-- End of daily output --

That's the automatic checking of the GELI SWAP creation... nothing unusual about it. It usually selects 4 of the 2GB partitions on your pool disks for use and can dynamically re-allocate as needed to others.

is this indicative of something I need to do, or is there a way to clear this error in the mirrors?

Nothing to do/clear.

copying a very large amount of content from a backup server to our FreeNAS box, and after a few hours it failed. Then I got some error notifications and a degraded Raidz array.

That's the thing you need to be looking at. Sounds concerning, but you've provided no hardware details for any further help to be provided at this point (unsupported NICs or maybe SMR disks would be the first things I would check).