I added two new sd disks. Trying to add both together as ZFS pool. When starting the array, one sd disks shows up as pool. The second doesn't mirror, but instead just shows under UD and can be mounted there.

Any help appreciate!

Daniel

tower-diagnostics-20260421-2206.zip

Assuming this is a new pool, erase the devices after assigning them to a new pool. Before starting the array, click on the first pool device and then "erase"

I still cannot get it to work... :-( Maybe an issue with my SSDs?

I added two brand-new SSD disks to a pool. File system ZFS, Allocation Mirror, Compression On, Autotrim On, Enable User Disk assignment Yes.

I am getting "Unmountable: wrong or no file system".

Will share a diagnostic log shortly. Any thoughts?

Post the diagnostics after a format attemp.

Now tried to format the disks as UD, which worked. But it gives me an error message when mounting. Diagnostic attached.

tower-diagnostics-20260423-1314.zip

Try formatting them in the same pool with Unraid, erase again first, then post diags after the format.

It worked now. But I am very worried. It feels that I just redid the same thing several times. And eventually it worked. Maybe there is some issue with cabling? Or a faulty disk? or a fake disk? or whatever else that could lead to this?

Is there anyway that I can pressure-test whether this is now indeed functioning before I put data on the pool?

We would need to see the diags when it failed to try and see what the issue was.

36 minutes ago, steve1977 said:

Now tried to format the disks as UD, which worked. But it gives me an error message when mounting. Diagnostic attached.

tower-diagnostics-20260423-1314.zip

That's the one here?

Wasn't that after trying to format with UD? I meant after attempting to create a pool.