Hi, I knew I should have waited! These things always go wrong for me! It boots fine using internal boot, but the data pool came up as btrfs, so I changed it to ZFS, and now it refuses to format!! Do I just wipe the whole cache drive and start again?

Thanks, Tim

tower-diagnostics-20260518-1341.zip

you will need to delete the folder /mnt/cache_two and then reformat. unraid is weird and will not finish the format if the folder exists prior to the format.

(or use a different name other than "cache_two")

May 18 13:23:20 Tower emhttpd: shcmd (4096): /usr/sbin/zpool create -f -o ashift=12 -O dnodesize=auto -O acltype=posixacl -O xattr=sa -O utf8only=on -m /mnt/cache_two cache_two   /dev/nvme0n1p4 
May 18 13:23:20 Tower root: mountpoint '/mnt/cache_two' exists and is not empty
May 18 13:23:20 Tower root: use '-m' option to provide a different default
May 18 13:23:20 Tower emhttpd: shcmd (4096): exit status: 1

Edited May 18May 18 by MowMdown

Thanks, that was it! 😊