Systemd Shutdown not finishing

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https://bbs.archlinux.org – Thank you very much for your answer I decided to keep dmraid because was the software used by the latest live Ubuntu distro and it could read, mount, umount the Raid normally and shutdown gracefully. I know mdadm can do the same, but something does not work. I can mount the volume from Nautilus (btw, I am using Gnome 3) but I can't umount it (device busy) so the shutdown process still does not finish. Here is the output of lsblk, focused on the RAID drives:sdc 8:32 0 298.1G 0 disk └─sdc1 8:33 0 298.1G 0 disk sdd 8:48 0 298.1G 0 disk └─sdd1 8:49 0 298.1 (HowTos)