You should be able to just create the partition with the correct layout, since we know the starting sector, and do a new config to reimport the disk:

• first unmount the filesystem with umount /x

• unload the loop device loosetup -d loop3

• Create the partition, check the disk is still /dev/sdl, and adjust if required: sgdisk -o -n 1:411648:0 /dev/sdl

• Reboot Unraid, this is required

• After the reboot, disk8 should show as wrong; go to Tools - New Config - Keep all - Apply.

• start the array, and the issue should be resolved

I did that. all data saved except oops formatted it and forgot to cp all the /music/. probably the most expendable data to lose so could have been worse. all that porn, took years to curate!

Edit: I saw your second second post. Yeah no I just copied the data to a drive on the array, oh well, about 4tb data saved. thanks for the help.

Edited January 4Jan 4 by paradox.actual