After resolving a recent issue (https://forums.unraid.net/topic/199400-corrupt-usb-stick/) I updated to the latest version of UNRAID (6.12.10 -> 7.3.1). Immediately before the update I ran a successful parity check. And after updating and rebooting, the parity disk is now marked as missing. All other disks are recognized and assigned correctly.

I have the Unassigned Devices plugin and the parity disk appears there. The only option that appears is the parity disk dropdown is "no device". I also can't select that disk in the dropdowns for the array data disks or my cache pool.

And since I'm missing a disk, I cannot start the array.

Diagnostics and syslog are attached.

natasha-diagnostics-20260614-2208.zip natasha-syslog-20260614-2208.txt

Edited June 15Jun 15 by CivBase

Parity disk doesn't have a partition; open a terminal window and type

sgdisk -o -a 8 -n 1:32K:0 /dev/sdX

Replace X with the correct parity identifier, sdg from the diags, but this can change if you reboot.

After that, reboot the server and see if it now works.

That worked. Thanks!

Older versions would not require a partition layout to exist, but since 7.2 it's required.

Parity should still be 100% valid, assuming it was before, but it may be good to run a check when you can, or at least just the first couple of GBs to confirm.