Hi all,
I have a Community Edition on version 25.04.2.6 built from an old Dell Precision workstation. I had a disk fail so I had to shut it down to replace the disk. After starting it back up pool1 is offline and in the storage dashboard I see the new unused disk and the existing disks are showing as “disks with exported pools”. Under Topology it says Pool1 contains offline VDEVs. I’m not really sure what to do from here and I really don’t want to lose the data.
Did you get an introductory email with info on completing a Tutorial by TrueNAS Bot? Do that first to get your forum trust level up so you can post links and screenshots.
Posting your full hardware and pool setup as it should have been may help. Post back using Preformatted text mode (</>) or Ctrl+e for the following commands, each in there own Preformatted text box.
sudo zpool import
sudo zpool status -v
Thanks, I didn’t see the email from the system.
pool: Pool1
id: 11798155922245158619
state: DEGRADED
status: One or more devices contains corrupted data.
action: The pool can be imported despite missing or damaged devices. The
fault tolerance of the pool may be compromised if imported.
see: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-4J
config:
Pool1 DEGRADED
raidz1-0 DEGRADED
b274b94f-10ab-4d8a-959c-efc1088cb656 ONLINE
d7532070-9192-437c-8b29-7d68f6e7d083 ONLINE
spare-2 UNAVAIL insufficient replicas
7f02e797-06ce-4887-ac8a-279ca34847be UNAVAIL
3485cd6a-3480-4bd2-8b5f-2f563abb8fe4 UNAVAIL
cache
4b16759f-7c61-423d-bd60-9401b6907503
spares
3485cd6a-3480-4bd2-8b5f-2f563abb8fe4
admin@LFTrueNAS[~]$ sudo zpool status -v
pool: boot-pool
state: ONLINE
scan: scrub repaired 0B in 00:00:57 with 0 errors on Fri Mar 20 03:45:59 2026
config:
NAME STATE READ WRITE CKSUM
boot-pool ONLINE 0 0 0
sda3 ONLINE 0 0 0
errors: No known data errors
Any chance you pulled the wrong disk or knocked a cable loose? Generally (not always), if you have the spare ports & are able to leave faulted disks attached + attach new drive (as long as they aren’t causing additional issues or are completely dead), it can help resilvering.
I double checked the connections before I put it back together, so I don’t think anything is loose, and I pulled the drive based on the serial number. This was the list of disks before I shut the system down.
This is what it looks like now. So it looks like one of the old disks isn’t showing up. I’ll have to go pull it apart again and re-seat the cabling.
If everything’s securely plugged in, but suddenly you’re not seeing a SATA drive, it’s possible that one of the SATA ports is shared with an m.2 slot.
Do you happen to know the model of your motherboard?
What does this reveal?
lsblk -o NAME,MODEL,SERIAL,PTTYPE,TYPE,SIZE,PARTTYPENAME,PARTUUID
I’m also a touch confused on why the drive was showing as a “spare” - was this actually a hot spare that was never added to the pool, but kicked in & kept it alive previously? How many drives total are there meant to in this pool - I hope three.
admin@LFTrueNAS[~]$ lsblk -o NAME,MODEL,SERIAL,PTTYPE,TYPE,SIZE,PARTTYPENAME,PARTUUID
NAME MODEL SERIAL PTTYPE TYPE SIZE PARTTYPENAME PARTUUID
loop1 loop 366.8M
sda ST12000NT001-3MD101 ZZ006XEL disk 10.9T
sdb SK hynix SC311 SATA 256GB MS79N566810309H0E gpt disk 238.5G
├─sdb1 gpt part 1M BIOS boot 939209a7-abe3-4068-a6b4-287d97302b07
├─sdb2 gpt part 512M EFI System 1e5aec6c-f821-4be3-af34-64d6ec0c5f96
├─sdb3 gpt part 222G Solaris /usr & Apple ZFS c77c4669-2a80-4aab-872b-35aa6481b7f3
└─sdb4 gpt part 16G Linux swap 30fa62b1-8ccb-482f-ac36-cf345bb864d2
sdc WDC WD121KRYZ-01W0RB0 8CJW7A2E gpt disk 10.9T
└─sdc1 gpt part 10.9T Solaris /usr & Apple ZFS b274b94f-10ab-4d8a-959c-efc1088cb656
sdd WDC WD121KRYZ-01W0RB0 8CJW799E gpt disk 10.9T
└─sdd1 gpt part 10.9T Solaris /usr & Apple ZFS d7532070-9192-437c-8b29-7d68f6e7d083
nvme0n1 Patriot M.2 P300 256GB P300HHBB231109000603 gpt disk 238.5G
└─nvme0n1p1 gpt part 238.5G Solaris /usr & Apple ZFS 4b16759f-7c61-423d-bd60-9401b6907503
After shutting down, reseating cables, and powering up again, The storage dashboard looks like this:
But when I click on disks, it’s still not showing one of the original disks, serial 8CJVUKLE. It was originally set up with 4 disks.
What about zpool status -v
This shows that the drive is indeed not detected by the system.
How are your disks connected? Direct to motherboard? Any change if you swap drives around?
admin@LFTrueNAS[~]$ zpool status -v
zsh: command not found: zpool
They are connect to a SATA daughterboard. I can try connecting the drive that is not appearing directly to the motherboard.
…Mind giving some details on that daughterboard? Also yeah, try direct to motherboard.
Try sudo zpool status -v. Sort of funny because you did it once and posted the results. That SUDO gets me every so often, also.
Now I’m not the ZFS expert however @Lunatic when you say you replaced the drive, can you be a bit clearer on exactly the steps you took. What I’m looking for is, did you use the GUI to replace the drive?
Also, it looks like you only have three physical HDDs, two are part of your pool (sdc and sdd) but sda is not part of your pool. I don’t know where you started from, did you have 4 HDDs installed and then removed 2?
Again, I’m not the ZFS expert but it looks like you need to REPLACE “spare-2” with the one available drive sda/sdb? It looks like your drive idents changed? Either way, use the unassigned 10TB drive.
Let someone else tell you what to do, but I think I’m on the right track. Maybe you did use the GUI?
EDIT: Why did you export the pool?
No, the dead drive didn’t appear in the GUI at all.
There are 4 HDDs, before I replaced the dead one, the GUI showed 3.
I didn’t, it did that on it’s own. Though that message did seem to go away after the 2nd restart post drive change.
Currently waiting on it to stabilize after moving the missing drive to a different SATA connector. It’s almost unresponsive, so it’s taken a while to even be able to run shell commands.
admin@LFTrueNAS[~]$ sudo zpool status -v
[sudo] password for admin:
pool: Pool1
state: DEGRADED
status: One or more devices could not be used because the label is missing or
invalid. Sufficient replicas exist for the pool to continue
functioning in a degraded state.
action: Replace the device using 'zpool replace'.
see: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-4J
scan: scrub in progress since Sun Mar 15 00:00:15 2026
2.72T / 8.43T scanned at 74.4M/s, 2.30T / 8.43T issued
1.16M repaired, 27.28% done, no estimated completion time
config:
NAME STATE READ WRITE CKSUM
Pool1 DEGRADED 0 0 0
raidz1-0 DEGRADED 65 0 0
b274b94f-10ab-4d8a-959c-efc1088cb656 DEGRADED 98 0 0 too many errors
d7532070-9192-437c-8b29-7d68f6e7d083 ONLINE 0 0 0 (repairing)
spare-2 UNAVAIL 0 0 0 insufficient replicas
11282278677688116273 UNAVAIL 0 0 0 was /dev/disk/by-partuuid/7f02e797-06ce-4887-ac8a-279ca34847be
3485cd6a-3480-4bd2-8b5f-2f563abb8fe4 REMOVED 0 0 0
cache
4b16759f-7c61-423d-bd60-9401b6907503 ONLINE 0 0 0
spares
3485cd6a-3480-4bd2-8b5f-2f563abb8fe4 UNAVAIL
errors: No known data errors
pool: boot-pool
state: ONLINE
scan: scrub repaired 0B in 00:00:57 with 0 errors on Fri Mar 20 03:45:59 2026
config:
NAME STATE READ WRITE CKSUM
boot-pool ONLINE 0 0 0
sda3 ONLINE 0 0 0
errors: No known data errors
Still looks like it isn’t seeing the drive.
admin@LFTrueNAS[~]$ lsblk -o NAME,MODEL,SERIAL,PTTYPE,TYPE,SIZE,PARTTYPENAME,PARTUUID
NAME MODEL SERIAL PTTYPE TYPE SIZE PARTTYPENAME PARTUUID
loop1 loop 366.8M
sda SK hynix SC311 SATA 256GB MS79N566810309H0E gpt disk 238.5G
├─sda1 gpt part 1M BIOS boot 939209a7-abe3-4068-a6b4-287d97302b07
├─sda2 gpt part 512M EFI System 1e5aec6c-f821-4be3-af34-64d6ec0c5f96
├─sda3 gpt part 222G Solaris /usr & Apple ZFS c77c4669-2a80-4aab-872b-35aa6481b7f3
└─sda4 gpt part 16G Linux swap 30fa62b1-8ccb-482f-ac36-cf345bb864d2
sdb WDC WD121KRYZ-01W0RB0 8CJW7A2E gpt disk 10.9T
└─sdb1 gpt part 10.9T Solaris /usr & Apple ZFS b274b94f-10ab-4d8a-959c-efc1088cb656
sdc WDC WD121KRYZ-01W0RB0 8CJW799E gpt disk 10.9T
└─sdc1 gpt part 10.9T Solaris /usr & Apple ZFS d7532070-9192-437c-8b29-7d68f6e7d083
sdd ST12000NT001-3MD101 ZZ006XEL disk 10.9T
nvme0n1 Patriot M.2 P300 256GB P300HHBB231109000603 gpt disk 238.5G
└─nvme0n1p1 gpt part 238.5G Solaris /usr & Apple ZFS 4b16759f-7c61-423d-bd60-9401b6907503
System seems to have stabilized a bit, I now see the unused drive in the GUI and have the option to add it to the pool.
I’m starting to think I had two drives go, not just one.
It look like neither one of the drives listed as “spare” are there, according to the lsblk data, and drive sdd now is not assigned to any pool.
You need to REPLACE the spare2 drive.
Try this: (all based on your last lsblk output)
Let us know.
P.S. Do you have a backup of any important data? I’ve been all over the place this morning so I don’t recall if you stated this.
Here’s the Manage Devices as it stands.
Thankfully this NAS isn’t hosting anything critical. I won’t be happy if I lose it, but it’s also not the end of the world. I set this up because I was given a bunch of free hardware and I wanted to play around with TrueNAS.
Mind giving some details on this free hardware & specifically whatever it was that had the drives connected to it that isn’t the motherboard?
It’s a Dell Precision T3610 workstation with an add on GLOTRENDS SA3026-C 6-Port PCIe X4 SATA Expansion Card. Originally had 4 WD Gold 12TB disks.
