I have a z/linux SLES12 system built with the btrfs file system.
I successfully add and resize the file system.
When I reboot the system I hit an endless loop on the system with a "start job".
btrfs device add /dev/dasda /
btrfs filesystem resize max /

A start job is running for dev-disk-by\x2duuid-b2732... 5s
I am able to do this with a system built with the xfs file system.
I am thinking that maybe the device needs to be added to the kernel!?