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There are no disks in your diagnostics that would usually be assigned as cache. That is a drive that would usually be assigned as cache, so that is the likely explanation for missing cache pool.

This is the preferred method for anything you might consider putting in go

So drive 11 was replaced. Be sure to keep the original drive as it is, it should still be readable and you can probably get files from it as an Unassigned Device. Looks like you don't have that plugin installed so you will need it.

Which was the proper one? 11 or 12? Start the array in normal (not maintenance) mode and post new diagnostics.

These shouldn't be in go

Attach Diagnostics ZIP to your NEXT post in this thread.

Yes, it failed self-test so must be replaced.

Removing disks from array | Unraid DocsThere may come a time when you want to remove a disk from your Unraid array. Whether you're looking to save on power, retire an old or unreliable drive, or repurpose hardware for a different use, the

User Script plugin isn't installed in SAFE mode and nothing in go is doing it either. What other computers on your network are trying to access the backup user share?

Something is creating a path to /mnt/user/backup before Unraid can create user shares. Do you have a user script or maybe some remote process referencing that path?

Possibly some corruption with the emulation is causing user shares to not work completely. New Diagnostics will tell more.

Start the array in normal (not maintenance) mode and post new diagnostics.

I am wondering if the Windows error message is an accurate description of the real problem.

Doesn't floor mean a drive won't be selected if it has LESS than that amount free? All drives have more than 1GB free.

What happens if you use the stock go file?

Is that message appearing on your PC? Is it Windows or what?

You might try asking on the NUT thread.

If you wanted to run 2 computers from that UPS, you could put the interface on the other computer and do the master/slave method. Of course, the other computer would also have to be on when your server was. I have a Windows PC on the same UPS as my Unraid but in my case Unraid is the master and PC gets the UPS status over the network from Unraid.

Maybe something here for you

prolific or ftdi?

And putting docker/VMs off the array will allow array disks to spin down.

Good fix! Nothing got put in lost+found for that disk. Sometimes fixing "forgets" folders and filenames for some files.

Maybe not all users, but with TPM licensing flash drive can be eliminated: https://docs.unraid.net/unraid-os/release-notes/7.3.0/#onboarding-and-internal-boot

Where are you actually seeing this?

Does your server actually have RS-232 port? Or are you trying to use USB adapter?