ZFS Pool Unmountable After USB Recovery

[ajs]

Hey Unraid Community.

 

My Unraid auto-shutdown when my UPS had about 10 minutes of battery left during a power outage, as configured. However, when I powered it back on, the USB got corrupted and it wouldn't boot.

 

I tried to do some data recovery on the USB, but at the end of the day I had an 8 month old back up of the Flash USB and just formatted the same USB key (another on order), got Unraid back on it, copied /config and booted back into Unraid.

 

However, at least one of two cache (tier1-cache) did not come back up and gives the error: "Unmountable: Unsupported or no file system"

 

The backup is several months old, Nov 2023 and I am unsure if potential changes between then and now is causing the problem with the caches.

 

When the array is offline, I can see the two NVMEs, however the only option Unraid is currently giving me is to format. As these were front-end cache for AppData and Domains, I'd prefer not. Most of the data is backed up offline if I really need to recover.

Here are some screenshots, home

 

 

 

 

 

[JorgeB]

Post the diagnostics and the output from

zpool import

 

[ajs]

Good Morning, here is the output from "zpool import".

 

 

Looks like I have the pool name wrong. This is likely from the backup being older and missing the current configuration.

 

What would you suggest is the corrective?

 

(I will open a new thread on the UPS "graceful" auto-shutdown nuked my USB)

[JorgeB]

Pool looks OK, post the diagnostics after array start.

[ajs]

Attached is the diagnostic file.

 

mothership-diagnostics-20240916-1109.zip

 

Thanks for looking at this @JorgeB

[JorgeB]

Try re-importing the pool and it should mount, stop the array, unassign both pool devices from the tier1 pool, start array, stop array, re-assign both devices and start array, the pool should import, if it doesn't post new diags.

[ajs]

Thank you @JorgeB That brought the pool back with data.

 

Last question. VMs came online but Docker says there are no containers. Is this just a matter of me recreating each container and pointing it back to its AppData folder?

[JorgeB]

As long as you have the appdata share and the user-template folder on the flash drive, you can just recreate the image and add them from previous apps:

 

https://docs.unraid.net/unraid-os/manual/docker-management/#re-create-the-docker-image-file
Then:
https://docs.unraid.net/unraid-os/manual/docker-management/#re-installing-docker-applications
Also see below if you have any custom docker networks:
https://docs.unraid.net/unraid-os/manual/docker-management/#docker-custom-networks