run_hook ()
{
    #TODO scan for these somehow...
    /bin/modprobe -aq linear multipath raid0 raid1 raid456 raid10>/dev/null 2>&1
    # md= can be specified multiple times.  The simplistic commandline
    #  parsing does not handle this, so we will let mdassemble parse it
    # create md devices  for installation
    for i in $(seq 0 15); do
	/sbin/mdadm --create /dev/md$i > /dev/null 2>&1
        /sbin/mdadm --create -a mdp /dev/md_d$i > /dev/null 2>&1
    done
    for i in $(replace $(echo $md) ',' ' '); do 
	case $i in d[0-9])
    		mdadm --assemble --auto=mdp /dev/md_$(replace $(echo $md) ',' ' ')
    		export USE_RAID_ARRAY=1
		;;
    	esac
    done
    if  ! [ "$USE_RAID_ARRAY" = "1" ] ; then
      /bin/mdassemble ${CMDLINE}
    fi
}