Copyright: Charles Steinkuehler <charles@steinkuehler.net>, except he borrowed
some code from other sources. He's cooperative about rewriting and/or doing
the paperwork.
Upstream: pending

Index: b/util/grub-install.in
===================================================================
--- a/util/grub-install.in
+++ b/util/grub-install.in
@@ -81,6 +81,50 @@
 EOF
 }
 
+# Usage: getraid_mdadm mddevice
+# Routine to find a physical device from an md device
+# If found, the first grub BIOS device (from device.map) is returned 
+# If no BIOS drives match the RAID devices, the first device returned
+# from mdadm -D is returned
+getraid_mdadm() {
+	device=$1
+	mdadm=$(mdadm -D "$device") || {
+		echo "$PROG: mdadm -D $device failed" >&2
+		exit 1
+	}
+	eval "$(
+		echo "$mdadm" | awk '
+			$1 == "Number" && $2 == "Major" { start = 1; next }
+			$1 == "UUID" { print "uuid=" $3; start = 0; next }
+			!start { next }
+			$2 == 0 && $3 == 0 { next }
+			{ devices = devices "\n" $NF }
+			END { print "devices='\''" devices "'\''" }
+		'
+	)"
+
+	# Convert RAID devices list into a list of disks
+	tmp_disks=`echo "$devices" | sed -e 's%\([sh]d[a-z]\)[0-9]*$%\1%' \
+					 -e 's%\(d[0-9]*\)p[0-9]*$%\1%' \
+					 -e 's%\(fd[0-9]*\)$%\1%' \
+					 -e 's%/part[0-9]*$%/disc%' \
+					 -e 's%\(c[0-7]d[0-9]*\).*$%\1%' \
+					 -e '/^$/d' |
+				     sed -n '1h;2,$H;${g;s/\n/|/g;p}'`
+
+	# Find first BIOS disk that's a member of the RAID array
+	# Default to first RAID member if no tmp_disks are BIOS devices
+	set -- `egrep $tmp_disks $device_map | \
+		sort | \
+		sed -n 1p `
+	device=${2:-${tmp_disks%%|*}}
+
+	# Return first partition on BIOS disk that's part of the RAID
+	echo "$devices" | \
+		sed -n "\:${device}:p" | \
+		sed -n 1p
+}
+
 # Usage: convert os_device
 # Convert an OS device to the corresponding GRUB drive.
 # This part is OS-specific.
@@ -96,6 +140,10 @@
     # Break the device name into the disk part and the partition part.
     case "$host_os" in
     linux*)
+	# Find an actual physical device if we're passed a RAID device
+	case $1 in
+		/dev/md*)  set -- `getraid_mdadm $1`
+	esac
 	tmp_disk=`echo "$1" | sed -e 's%\([sh]d[a-z]\)[0-9]*$%\1%' \
 				  -e 's%\(d[0-9]*\)p[0-9]*$%\1%' \
 				  -e 's%\(fd[0-9]*\)$%\1%' \