IIRC when you add a device to a mirror say with; mdadm --create --verbose /dev/md127 --level=mirror --raid-devices=1 --force /dev/sdb3
I thought the filesystem is maintained and so /dev/md127 should be immediately mountable, however, it doesnt mount. mount: wrong fs type, bad option, bad superblock on /dev/md127, missing codepage or helper program, or other error Am I confusing linux software raid with solaris?