I currently have two pools on my unraid. 

Pool 1 "raidio":

- 48 Drives

- 8 vdevs of 6 devices

- raidz1

 

Pool 2 "space":

- 12 drives

- two way mirror vdevs

 

Over last night, the unraid web interface started to get unresponsive. Then this morning I couldnt perform any tasks.

I was able to reboot once, but after reboot, and attempting to start the array. The interface shows "mounting disks" and never completes. 

I can click into Pool 1 and see the pool information, but Pool 2 will not show anything more than individual drive information.

 

The unraid web interface is responsive but will never complete Mounting Disks. 

 

Attached are two diagnostic drops, one from earlier today, and one just now.

** Note, this most recent. I hard reset the server, with the drive shelfs unplugged.  After reboot, i waited for the unraid interface to show, and then logged in.  At this point, I reconnected the drive shelves.  All drives populated to where they should be. I then attempted to start the array. Now Im at the same spot, it will not complete mounting the disks. 

 

I do see Read activity on Pool 1 drives totaling ~30 MB/s

 

The only tasks being performed was copying data (media files) from pool 1 to pool 2 and importing them to Radarr. So nothing complex. 

 

Thank you so much for any input that may help!

nucserver-diagnostics-20250510-1210.zip nucserver-diagnostics-20250510-1559.zip

After coming back to my laptop, I saw this error in the log:

Update:

 

I hard reset the server again, this time I kept POOL 1 unattached. When I logged back into the web interface, I removed POOL 1.

 

With just POOL 2 in place, the array mounted and started immediately.  

 

I am now looking into potential issues on POOL 1. 

Attempted to attached POOL 1 to a spare unraid server, issue persists with this pool. 

 

Diagnostics attached here, from my second server, with POOL 1 stuck on Mounting Disks. 

 

(POOL 2 and first server appear to be working normal now)

oldio-diagnostics-20250510-2247.zip

Server 2, with POOL 1 attached. Has finally mounted after about 30 minutes of waiting. 

 

Here is the current Diagnostics from Server 2 / POOL 1 setup. 

 

 

*** Again thank you to any one that may have input on this ***

oldio-diagnostics-20250510-2305.zip

What are the disks in pool1 connected to hardware wise? Could it be a HBA controller going bad?

See if it mounts read-only:

 

zpool import -o readonly=on space

 

 

Sorry for the late closure on this. When I separated the pools to two machines, they started without issue. Since then, I have had no issue with them.

@MowMdown My setup has all my drives in DS4248 disk shelves. They appear to be working correctly.

@JorgeB I never had a chance to run your command.

Thank you both for jumping in.