Added SMB option and updated device for the new host.

Signed-off-by: Andreas Pohl <apohl79@gmail.com>
Added SMB option and a check if the md device exists.

The kernel can assemble the device during boot. So the dev file will
already be there when we are initializing and mounting the file
system.

Signed-off-by: Andreas Pohl <apohl79@gmail.com>