code :
dmraidev() {
    local dev raid major
    major=$((0x$(stat -L -c '%t' $1)))
    if [ -x /sbin/dmraid -a "$major" = "$dm_major" ]; then
	for raid in `/sbin/dmraid -sa -c`; do
	    [ ${1#*/$raid} != ${1} ] && \
		dev=`/sbin/dmraid -r -c -c | awk -F: -v raid=$raid '$3 ~ raid {print $1}'`	
	done
    fi
    dev=1
    if [ -n "$dev" ]; then
	root_dmraid=1
	need_dmnod=1
	findmodule -dm-mod
	findmodule -dm-mirror
	findmodule -sd_mod
	nonraiddevices="$nonraiddevices $dev"
    else
	nonraiddevices="$nonraiddevices $1"
    fi
}

log du code:
+ rootdev=/dev/mapper/isw_fieggaffd_Volume05
+ fstabrootdev=/dev/mapper/isw_fieggaffd_Volume05