Here is my confusion.
As you can see from my device list, the bad disk is no longer listed so I don’t know what to replace. BTW, the new disk is SDA.
SDB is the small boot drive. I tried to force that to replace but that didn’t work and I got the following error message:
So I’m kind of stymed. Perhaps I don’t understand your instruction as to what disk on the list I replace
Thanks for your help,
Roger
Can you make your Device List screenshot so I get the whole GUI window and not snip it so much? I can’t see the menu options to the right. What happened to the 9054689916214298171 UNAVAIL 0 0 0 was /dev/sdb2 listed in your first post?
Please just post the images directly in the replies.
Run this in a Shell window and post the results back using Preformatted Text (</>) I want to verify what disks are where and what usage.
sudo ZPOOL_SCRIPTS_AS_ROOT=1 zpool status -vLtsc lsblk,serial,smartx,smart
Okay, I put the bad disk into the machine and somehow used a shell command to get it listed in the pool. I then swapped out the bad disk for the good one and tried replacing it and got the following error:
Please take the tutorial from the forum bot so you can put images in your posts.
Here is where I am now after physically removing the bad disk and putting in the new one:
All three disks are listed as unassigned. And the tank devices are listed as empty:
The pool was named “tank” and I know it is in there somewhere because if I try to create a pool with the same name i get an error saying the name is already in use. I don’t know how to access it and get the list of drives to I can replace one.
Roger
One other thing, I tried the zpool import command and it failed because the bad drive is no longer in the machine:
Copy and Paste images into the reply text box or drag and drop them from your folder or desktop to the text box. Do not use dropbox.
If posting commands from the Shell or CLI, Use preformatted text (</>). You did it in your first post.
These are the commands you should run in the Shell and post back the results in Preformatted text. One box for each command. It looks like you added a second VDEV to your Raid-Z1 VDEV under the pool TANK. It may be time to destroy the pool setup and start fresh. You will need to load all your data, apps, VMs, etc. if that is the case.
lsblk -bo NAME,LABEL,MAJ:MIN,TRAN,ROTA,ZONED,VENDOR,MODEL,SERIAL,PARTUUID,START,SIZE,PARTTYPENAME
sudo zpool import
sudo zpool status -v
Here it is in pre-formated text:
root@truenas[~]# lsblk -bo NAME,LABEL,MAJ:MIN,TRAN,ROTA,ZONED,VENDOR,MODEL,SERIAL,PARTUUID,START,SIZE,PARTTYPENAME
NAME LABEL MAJ:MIN TRAN ROTA ZONED VENDOR MODEL SERIAL PARTUUID START SIZE PARTTYPENAME
sda 8:0 sata 1 none ATA ST4000VN008-2DR166 ZDHBA2TB 4000787030016
├─sda1 8:1 1 none c54fbe2f-1ae2-11f0-afe1-002590607e4c 128 2147483648 FreeBSD swap
└─sda2 tank 8:2 1 none c584bed0-1ae2-11f0-afe1-002590607e4c 4194432 3998639460352 FreeBSD ZFS
sdb 8:16 sata 1 none ATA ST4000VN006-3CW104 ZW63AAF9 4000787030016
├─sdb1 8:17 1 none c5593b0f-1ae2-11f0-afe1-002590607e4c 128 2147483648 FreeBSD swap
└─sdb2 tank 8:18 1 none c57a40da-1ae2-11f0-afe1-002590607e4c 4194432 3998639460352 FreeBSD ZFS
sdc 8:32 sata 0 none ATA SanDisk SSD PLUS 240GB 22195P800260 240057409536
├─sdc1 8:33 0 none e4c4dc28-0765-11ed-a363-002590607e4c 40 524288 BIOS boot
├─sdc2 boot-pool 8:34 0 none e4cf2e84-0765-11ed-a363-002590607e4c 33555496 222868537344 FreeBSD ZFS
└─sdc3 8:35 0 none e4ca2f18-0765-11ed-a363-002590607e4c 1064 17179869184 FreeBSD swap
└─sdc3 253:0 0 none 17179869184
sdd 8:48 sata 1 none ATA ST4000VN008-2DR166 ZDHB7RHZ 4000787030016
├─sdd1 8:49 1 none c53c0c4e-1ae2-11f0-afe1-002590607e4c 128 2147483648 FreeBSD swap
└─sdd2 tank 8:50 1 none c569b2d3-1ae2-11f0-afe1-002590607e4c 4194432 3998639460352 FreeBSD ZFS
root@truenas[~]# zpool import
pool: tank
id: 16955271357809025420
state: UNAVAIL
status: One or more devices contains corrupted data.
action: The pool cannot be imported due to damaged devices or data.
see: Message ID: ZFS-8000-5E — OpenZFS documentation
config:
tank UNAVAIL insufficient replicas
raidz1-0 DEGRADED
9054689916214298171 UNAVAIL
sdb2 ONLINE
sdd2 ONLINE
sda UNAVAIL invalid label
root@truenas[~]#
root@truenas[~]# zpool status -v
pool: boot-pool
state: ONLINE
status: One or more features are enabled on the pool despite not being
requested by the ‘compatibility’ property.
action: Consider setting ‘compatibility’ to an appropriate value, or
adding needed features to the relevant file in
/etc/zfs/compatibility.d or /usr/share/zfs/compatibility.d.
scan: scrub repaired 0B in 00:01:34 with 0 errors on Fri Jul 25 03:46:36 2025
config:
NAME STATE READ WRITE CKSUM
boot-pool ONLINE 0 0 0
ata-SanDisk_SSD_PLUS_240GB_22195P800260-part2 ONLINE 0 0 0
errors: No known data errors
root@truenas[~]#
I needed you to run the full command listed and post the results back in Preformatted Text so it is readable and can be copyied. It’s used for ‘code’
</> on the Toolbar or Ctrl+e. You can also use leading triple backticks and trailing triple backticks around the posted ‘code’. Backtick is by the 1 key on my keyboard. it has ~ and `
Looks like this
```
THIS IS MY POSTED CODE. It’s easy to read for others
```
The three commands in post 27 will allow us to keep the disk drives straight as names such as /dev/sda can change between reboots, etc. They aren’t unique as disk serial numbers. The other two will show your boot-pool and any other pools along with the disk info and your status of the pools.
I’m trying to figure out what you did, your current situation and if we can salvage it.
Ok. Here are the results from the first command:
NAME LABEL MAJ:MIN TRAN ROTA ZONED VENDOR MODEL SERIAL PARTUUID START SIZE PARTTYPENAME
sda 8:0 sata 1 none ATA ST4000VN008-2DR166 ZDHBA2TB 4000787030016
├─sda1 8:1 1 none c54fbe2f-1ae2-11f0-afe1-002590607e4c 128 2147483648 FreeBSD swap
└─sda2 tank 8:2 1 none c584bed0-1ae2-11f0-afe1-002590607e4c 4194432 3998639460352 FreeBSD ZFS
sdb 8:16 sata 1 none ATA ST4000VN006-3CW104 ZW63AAF9 4000787030016
├─sdb1 8:17 1 none c5593b0f-1ae2-11f0-afe1-002590607e4c 128 2147483648 FreeBSD swap
└─sdb2 tank 8:18 1 none c57a40da-1ae2-11f0-afe1-002590607e4c 4194432 3998639460352 FreeBSD ZFS
sdc 8:32 sata 0 none ATA SanDisk SSD PLUS 240GB 22195P800260 240057409536
├─sdc1 8:33 0 none e4c4dc28-0765-11ed-a363-002590607e4c 40 524288 BIOS boot
├─sdc2 boot-pool 8:34 0 none e4cf2e84-0765-11ed-a363-002590607e4c 33555496 222868537344 FreeBSD ZFS
└─sdc3 8:35 0 none e4ca2f18-0765-11ed-a363-002590607e4c 1064 17179869184 FreeBSD swap
└─sdc3 253:0 0 none 17179869184
sdd 8:48 sata 1 none ATA ST4000VN008-2DR166 ZDHB7RHZ 4000787030016
├─sdd1 8:49 1 none c53c0c4e-1ae2-11f0-afe1-002590607e4c 128 2147483648 FreeBSD swap
└─sdd2 tank 8:50 1 none c569b2d3-1ae2-11f0-afe1-002590607e4c 4194432 3998639460352 FreeBSD ZFS
Here’s what I get when I run sudo zpool import:
pool: tank
id: 16955271357809025420
state: UNAVAIL
status: One or more devices contains corrupted data.
action: The pool cannot be imported due to damaged devices or data.
see: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-5E
config:
tank UNAVAIL insufficient replicas
raidz1-0 DEGRADED
9054689916214298171 UNAVAIL
sdb2 ONLINE
sdd2 ONLINE
sda UNAVAIL invalid label
And here’s what I get when I run sudo zpool status -v:
pool: boot-pool
state: ONLINE
status: One or more features are enabled on the pool despite not being
requested by the 'compatibility' property.
action: Consider setting 'compatibility' to an appropriate value, or
adding needed features to the relevant file in
/etc/zfs/compatibility.d or /usr/share/zfs/compatibility.d.
scan: scrub repaired 0B in 00:01:34 with 0 errors on Fri Jul 25 03:46:36 2025
config:
NAME STATE READ WRITE CKSUM
boot-pool ONLINE 0 0 0
ata-SanDisk_SSD_PLUS_240GB_22195P800260-part2 ONLINE 0 0 0
errors: No known data errors
@HoneyBadger @NickF1227 Looking for help getting pool back.
The usual fatal mistake: You added the drive as a new vdev striped with the existing raidz1 vdev. If the new drive fails, the whole pool is lost.
There is only ONE WAY OUT of that: Backup. Destroy. Restore.
And now there is an invalid label… (@HoneyBadger: In a pool with two vdevs.)
I wonder why the drive is listed as sda by zpool import instead of sda2.
Do you have a backup of this pool? Was it important data? 
Our experts will certainly want to see the outputs of:
sudo zdb -l /dev/sda2
sudo zdb -l /dev/sdb2
sudo zdb -l /dev/sdd2
okay I i’ll destory the pool. how do I do that?
BTW. I tried restoring an earlier configuration and now I’m having trouble booting
You’re at the point where you might as well do a complete new install. Start from scratch.
You have a choice of Electric Eel 24.10, or Fangtooth 25.04. If you go with 25.04, it is due for an update this week or so. You might want to wait if you go with that as Classic Virtualization is to return
ok thanks
In GUI, Export the pool, and in the confirmation window, tick the little box to delete data and wipe the drives.
You do have a backup, or there was nothing important in the pool, right?
Thank you everyone. I deleted my pool and created a new one and all seems to be working