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Ahh dang, I'll have to see if I can cancel the order for the cache drive I got. Thanks though. PS, I was finally just able to resolve this... When I dropped into a terminal and ran `lsblk` on the SSD, it oddly still had all the Proxmox partitions on it, despite the preclearing and my prior attempts to format it. I then used `fdisk` to delete the existing partitions and create a new one, and restarted. Upon restarting, unRAID said something about the partition being incorrect/unusable, but I was then successfully able to use the built-in formatting utility (on the Main page) and use the drive as a cache drive. Interestingly, the formatting step this time actually took a bit of time (few mins) vs with my prior attempts where it was less than 30 seconds (likely because it was erroring almost immediately). Hope it helps someone in a similar situation.

Really appreciate the insight here. Per what you said, I went ahead and ordered a couple more drives for both cache and main data. Follow up question here - I was able to pre-clear the 240 GB SSD successfully (no errors in the log), does that imply anything about the health of the drive, does that mean it's safe to use? Thanks also for the suggestion on disabling Docker & VMs, will keep that in mind for the future.

I think after initially having the issues, at some point, I clicked into the drives, and though there were errors, the overall SMART status reported ok. You're right though, if I go to the Dashboard page, they all show as having errors. Perhaps I'm putting too much stock into overall SMART health.

Appreciate the input here. Apologies, yes, I had issues with the spinners initially, but while I do see some errors in their errors columns, the SMART status is reporting as ok, so I thought all was well. This SSD was used in a Proxmox system as both the main boot device as well as VM storage, so it seems like it should be fine, but will try another. I'm using the Preclear plugin to pre-clear all the disks now, fingers crossed. Thank you for the assist!

Appreciate the super fast replies. Diagnostics file attached.

Hi folks, i just installed UNRAID in trial mode. So far I've been able to add my 2 main disks (2TB xfs encrypted) and a 3rd disk as a parity disk (3TB). This seems to be fine. I'm having issues trying to set up a cache drive however: What I did: I bring down the array, then assign a 240 GB SSD to the cache pool, and then start the array. Result: Cache drive appears in pool and says "Unmountable: No file system" and FS is set to auto Ok, no problem, I'll just format it.. What I did: Under "Format will create a file system in all Unmountable disks.", I tick "Yes, I want to do this" and proceed with the format. Result: Cache drive says "Formatting" for a few seconds, followed again by "Unmountable: No file system". Ok, maybe auto is not the right fs, so let me meddle with that... What I did: Click on the cache drive, set File system type to xfs - encrypted, then hit Apply and Done, then on the Main screen, run Format again. Result: Cache drive says "Formatting" for a few seconds, followed now by "Unmountable: Missing encryption key". Ok, hmm I needed to provide a key before, maybe I just need to do that again? What I did: Stop the array, provide the encryption passphrase, then start the array. Result: Cache drive says "Unmountable: Volume not encrypted" I tried formatting the cache drive again after the message above, but it goes back to "Unmountable: Missing encryption key". Btw, I get stuck in the same loop if I use xfs encrypted for the cache fs also. I'm at my wits' end, would appreciate some help here.