Hi,

Enthusiastic Unraid amateur here. 
After trying to add a second drive to my cache pool, both drives now appear as "Unmountable: Unsupported or no file system".

Tried to do a New Config, removed drives, rebooted, adding one drive, then a second one, didn't work.

Diagnostics attached.

Would greatly appreciate your expert guidance.

Thanks all

hp-diagnostics-20240928-0858.zip

Edited September 28, 20241 yr by max-go

Was the pool btrfs or zfs? Also post the output from 

blkid

 

Here you go, thanks.

 

For some reason, I couldn't format it as btrfs. It is in xfs.

 

/dev/sdb1: UUID="892b2f9c-2af1-4195-8dcb-7e5304636b0c" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="04ab6e6a-8c8d-4eb4-92d5-c30b4d91b3c4"
/dev/sda1: UUID="304ff4a6-f124-41f7-b193-67d88739fc92" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="a89ecf03-5eeb-40c2-bd81-f67426f3e79e"
/dev/sdc1: LABEL_FATBOOT="UNRAID" LABEL="UNRAID" UUID="272C-EBE2" BLOCK_SIZE="512" TYPE="vfat"
/dev/loop1: TYPE="squashfs"
/dev/nvme0n1p1: UUID="ecd59968-f2d1-4f19-ac12-d8c1cb11dcc9" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="b00c2b5b-01"
/dev/sdd1: UUID="ecc88e4f-58e1-4e9a-b870-25a857a0c765" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="b00c2b59-01"
/dev/md2p1: UUID="892b2f9c-2af1-4195-8dcb-7e5304636b0c" BLOCK_SIZE="512" TYPE="xfs"
/dev/md1p1: UUID="304ff4a6-f124-41f7-b193-67d88739fc92" BLOCK_SIZE="512" TYPE="xfs"
/dev/loop0: TYPE="squashfs"
/dev/nvme1n1p1: UUID="c1cde7c1-10d5-4292-8dc3-7b86b0845780" BLOCK_SIZE="512" TYPE="xfs"

You cannot add a device to an xfs pool, set the pool slots back to 1, filesystem to auto or xfs, and it should import the old pool.

It worked, thanks!

That is showing a btrfs pool, but glad to hear it's resolved.

I formatted them in btrfs. Thanks