Added a 1Tb NVMe disk as a cache pool Selected the option to format. Formatting as BTRFS seems to have been successful, yet the status indicates "Unmountable: Unsupported or no file system"

 

 

I'm brand new to Unraid, having stood the server up in the last couple of days and purchased a Plus license. Liking what I see so far. Hoping for some help to get over this hurdle.

 

Diagnostics attached

unraid-jp-diagnostics-20240222-0646.zip

Since you enabled Docker and VM Manager before having cache, appdata, domains, and system shares have been created on disk1. I suggest disabling those until you have cache working, then you can see about getting them moved there.

Looks like you originally created this as a 2 device pool with the Acer SSD. Since they are not the same size you would have gotten a mirror with only the capacity of the smaller.

 

Have you tried removing the pool and doing that all over with only the nvme?

Thank you @trurl. I don't recall enabling docker and VM manager before adding the cache, but it's certainly possible as I didn't add the cache initially. I did briefly have a two drive cache scenario with the 1Tb NVMe and 240Gb SSD (obviously not a good idea). I had tried removing the pool entirely, unassigning the NVMe and SSD, and then recreating the cache pool with only the NVMe, and still faced the situation with the "Unmountable: Unsupported or no file system" message. However, I've not tried disabling Docker and VM Manager and recreating the cache pool, and report back the results here. 

Appreciate those such as yourself who help out in these forums. Looks like I need to updated my profile to include the specs of my UnRAID server.

Edited February 21, 20242 yr by tech101us
Misspelling

Just wanted to follow-up and close out this topic. In the end, the solution mentioned by @trurl was likely a partial solution. I did disable Docker and VM Manager. However, it seemed that perhaps there was some partitioning and/or filesystems on the NVMe drive that I needed to get rid of before I could properly format it as part of the cache pool. After ensuring the drive was no longer part of the pool, and ensuring it wasn't in some way mounted by the OS, I ran a couple of utilities against the drive to essentially zero it out (I think I used blkdiscard and perhaps dd) to achieve this. After doing so, and a reboot, I was successful in adding the drive back to the cache pool and formatting it.