ZFS pool won't mount after power outage (panic at range_tree)

[Nazu]

Greetings,

as by the title, I had a power outage today and since then, at least one of my ZFS pools seems to be corrupted and unable to mount. In the notifications I've seen that my UPS initiated a shutdown but was not able to gracefully put the system down. Now, when I try to start the array, I get a "panic at range_tree" error message and the system keeps stuck in starting the array.

I tried to scrub and check the status of my zpools but was not able to do so, as these actions only seem to be available when the pools are mounted. 

 

Any help is appreciated. 

inari-diagnostics-20240807-1854.zip syslog.txt

[JorgeB]

See if it mounts read-only:

 

zpool import -o readonly=on pool_name

 

If it works start the array, the pool will still show unmontable in the GUI but the data should be all under /mnt/pool_name, then backuk and re-format.

[Nazu]

Mounting in read-only mode works, nice to see that I can then start the array. Thanks for the advice, I will report back when I copied my data.

[Nazu]

Worked like a charm. So far, I could not find any dataloss and can focus on identifiying why my UPS did not execute a shutdown.

Thanks a lot!