one additional information
since suse 13.2 every boot waits exact 90sec... for something
# systemd-analyze blame
1min 30.594s systemd-udev-settle.service
16.849s wicked.service
412ms postfix.service
292ms SuSEfirewall2.service
243ms apparmor.service
the "systemd-udev-settle.service" seems to timeout and than additional mount
seems to be failing.