Truenas VM Serial # error adding USB drive to new pool

artofcode

New Member
Nov 8, 2025
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Hi All, I’ve had Truenas running nicely in a VM on Proxmox for several days. The current pool is RaidZ1 using nvme disks I Now I want to add USB storage to a new pool, but I’m getting a Topology error: “Disks have duplicate serial numbers: None (sdb, sdf)”

The USB disk is listed as unassigned when I try to create the new pool, and has the correct info.

In Proxmox I can see bus and ID info using lsusb, but there’s nothing under /dev/disk. So I don’t have any path info to use with qm set. I’ve tried adding storage with a couple different USB drives but get the same serial # error.

Am I missing something obvious?
 
I was facing the same issue! Fixed this by assigning a serial number to the disk.

Get the Disk ID -
Bash:
ls /dev/disk/by-id
This will return something like ata-WDC_WD5000LMVW-11VEDS0_WD-WX71XXXXXXX34
Now run in Proxmox shell:
Bash:
qm set 100 -scsi1 /dev/disk/by-id/ata-WDC_WD5000LMVW-11VEDS0_WD-WX71XXXXXXX34,serial=WD-WX71XXXXXXX34

After that, try creating a pool in TrueNAS again.
 
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