I think their might be a bug in the GUI for Linear Raid.
I want to create 2 x Linear Raid. The first 1 was created with no problems, /dev/md0 was created and I formatted the created Raid with EXT4 all went well.
When it came to creating the 2nd Linear Raid i.e. /dev/md1 it appeared to go OK and created the Raid but when I went to format the Raid the GUI wouldn't allow me I couldn't select a drive to format. I looked a bit further and clicked on the Mount rather than Create and lo and behold the Raid was there. It appears that when the Raid was created it made it look as if there was already a EXT4 file system on the Raid.
I had to go into ssh and do a wipefs -a /dev/md1 then return to the GUI and then I was able to format the Raid correctly.
Is this a bug or is this normal practise.