trurl

Except for Unassigned Devices, I don't recommend hotswapping drives with Unraid. Unraid won't do anything with a disk until you assign it, and you can't assign a disk without stopping the array.

Hasn't been rebooted since Oct 1, but disk identifiers (sdX) seem to change. Were you hotswapping?

I correct Claude and Gemini all the time. But This has been explained innumerable times on this forum, and especially in the context of converting from ReiserFS.

I'm kind of surprised Claude got all of this so wrong. One of the most basic things is that rebuild will result in the same filesystem as the original.

Release notes have: Is that at all related to this other problem?

Do you have a current flash backup? Also, your logs are full of container(s) restarting. Check the uptime of your containers on the Docker page to see where the problem is. And you have this problem: https://forums.unraid.net/topic/200823-docker-images-loosing-icon-and-then-log-filesystem-fills-to-100-and-then-crashes/

The emulated disk was repaired, but it still needs to rebuild the repaired contents to the physical disk. Since repair resulted in some lost+found, it might be worth seeing if the physical disk can be mounted with Unassigned Devices and decide if the physical contents are better than the repaired emulated disk contents.

Emulated disk9 is mounted and showing plenty of contents. You can rebuild to the same disk. https://docs.unraid.net/unraid-os/using-unraid-to/manage-storage/array/replacing-disks-in-array/#re-enabling-a-disabled-disk-rebuilding-onto-itself

SMART report for disabled disk9 looks fine. I would be surprised if it doesn't pass extended test, but let it complete. 10TB will take a while. Then start the array in normal (not maintenance) mode so we can make sure emulated disk9 is still mounted. Then post new diagnostics.

Also post new diagnostics

Depending on the extent of the corruptioin, filesystem repair may not be able to get the names of some files/folders, or which folder a file belongs in. Those are the files/folders it puts in lost+found. On the User Shares page, click on Compute... for the lost+found share, wait for the results, and post a screenshot.

post new diagnostics

You can access the current documentation from the "manual" link at bottom right of any page of your Unraid webUI. There is also a link to the current documentation at the top of any forum page. I don't see a SMART report for disabled disk9, but the emulated disk9 is mounted and showing plenty of data. If disk9 is connected now post new diagnostics.

SSDs in the array cannot be trimmed and can only be written at parity speed. SSDs belong in pools outside the parity array.

Does old server have any pools?