Hello Everyone, i just purchased a new Sandisk 1TB SSD and would like to use it as a cache drive.   My current unraid setup consists of all ZFS file system.  I keep encountering a msg that my SSD is unmountable even though it passed the preclear process and a SMART tests.  Looking through the logs, i encounter the following.

 

 

May  2 21:05:16 UNRAID root: mount: /mnt/cache: wrong fs type, bad option, bad superblock on /dev/sdh1, missing codepage or helper program, or other error.

May  2 21:05:16 UNRAID root:        dmesg(1) may have more information after failed mount system call.

May  2 21:05:16 UNRAID kernel: XFS (sdh1): Invalid superblock magic number

May  2 21:05:16 UNRAID emhttpd: shcmd (747): exit status: 32

May  2 21:05:16 UNRAID emhttpd: /sbin/btrfs filesystem show /dev/sdh1 2>&1

May  2 21:05:16 UNRAID emhttpd: ERROR: no btrfs on /dev/sdh1

May  2 21:05:16 UNRAID emhttpd: /mnt/cache: no btrfs

May  2 21:05:16 UNRAID emhttpd: shcmd (748): modprobe zfs

May  2 21:05:16 UNRAID kernel: spl: loading out-of-tree module taints kernel.

May  2 21:05:16 UNRAID kernel: znvpair: module license 'CDDL' taints kernel.

May  2 21:05:16 UNRAID kernel: Disabling lock debugging due to kernel taint

May  2 21:05:17 UNRAID kernel: ZFS: Loaded module v2.1.9-1, ZFS pool version 5000, ZFS filesystem version 5

May  2 21:05:17 UNRAID emhttpd: /usr/sbin/zpool import -d /dev/sdh1 2>&1

May  2 21:05:17 UNRAID emhttpd: no pools available to import

May  2 21:05:17 UNRAID emhttpd: cache: no uuid

May  2 21:05:17 UNRAID emhttpd: shcmd (749): mount -t reiserfs -o noatime,user_xattr,acl /dev/sdh1 /mnt/cache

May  2 21:05:17 UNRAID root: mount: /mnt/cache: wrong fs type, bad option, bad superblock on /dev/sdh1, missing codepage or helper program, or other error.

May  2 21:05:17 UNRAID root:        dmesg(1) may have more information after failed mount system call.

May  2 21:05:17 UNRAID emhttpd: shcmd (749): exit status: 32

May  2 21:05:17 UNRAID emhttpd: /mnt/cache mount error: Unsupported or no file system

 

 

Is there a way to change the the SSD drive solely to BTRFS even though all my other drives are ZFS so it can be use as a cache drive?

Have you actually tried to format it after adding it to Unraid as a pool?   If you have then please post a diagnostics zip file taken after an attempt to format.

 

in terms of the file system type you can set it explicitly by clicking on the drive on the Main tab.