Now it is time to see if I have learned anything.
1Tb SSD and 2 x 2Tb SATA HDDs, motherboard is a UEFI board but I have never used UEFI with this board.
obviously ignored it.
Using Gparted partition the SSD thus:
512MB EFI Partition
dev/sda1, formatted FAT32,
8 Gb allocated to SWAP
Partition the first HDD /dev/sdb1 primary, formatted btrfs , mounted as /data
Second HDD same size leave completely blank
the gparted disk and insert the Ubuntu Server disk commence the
Install the system and add the GUI using tasksel
the system is installed add the second HDD with two
lines in the terminal
btrfs device add -f /dev/sdc1 /data
sudo btrfs balance start -dconvert=raid1 -mconvert=raid1 /data
Enjoy the set up.
add any corrections.
reason I choose to use the g-parted step is because the ubuntu
partitioner was difficult to use.