OK I've got a problem here that I'm having some trouble resolving. Had a hard shutdown of my system and after reboot my ZFS array (12 disk RAIDZ2 single VDEV with mirrored set of Special devices and a mirrored set of log devices) is not usable any more. The pool and special subpools were showing as one device in the pool but no devices listed. I tried to recreate the array as best I could by changing the numbers and putting all the devices back in, but it would not start saying that the subpools were 'orphans'. Did a "New Config" as I was running out of ideas and was able to put the array back together and start the array, but on starting the array it comes up as "Unmountable" and only allows me to format. Here's the other weird part; when I go to stop the array all of a sudden it mounts the array and boom all the data is there but obviously all the services are shut down. After a clean reboot, I can import the pool with a "zpool import" but again everything seems broken and I can't start the services or the array properly. Diags attached. For the record this has all been with 7.2. This was a fresh build with 7.2 with a whole new pool and I was busy restoring data back. I had made some of it live so I'd really rather not lose data since the last backup (last night) and I really don't want to start the restoration seeds all over again (~30TB already restored before this happened) ixios-diagnostics-20251118-1123.zip

I thought I was clear, but sorry if I wasn't, the pool must have 16 slots, you must assign all the devices, including the subpool devices, all together, and leave the filesystem set to auto, they will be automatically sorted at array start. repeat the pool import.

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ZFS Unclean Shutdown led to Unmountable

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Solved by JorgeB

November 18, 2025Nov 18

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November 18, 2025Nov 18

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That was it. For anyone else searching this in future, create a single pool of ALL your devices not just the main pool data devices and assign them all. It'll get sorted out on first startup.

Thanks, @JorgeB

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ZFS Unclean Shutdown led to Unmountable

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