use udev rules to autoassemble a md raid and added mdmon pre-pivot

modules.d/90mdraid/70-mdadm.rules

@@ -0,0 +1,6 @@
+# This file causes block devices with Linux RAID (mdadm) signatures to
+# automatically cause mdadm to be run.
+# See udev(8) for syntax
+
+SUBSYSTEM=="block", ACTION=="add|change", ENV{ID_FS_TYPE}=="linux_raid*", \
+	RUN+="/sbin/mdadm -I --auto=yes $root/%k"

modules.d/90mdraid/install

@@ -1,4 +1,8 @@
 #!/bin/bash
 dracut_install mdadm
-inst_hook pre-mount 10 "$moddir/mdraid.sh"
+[ -x  /sbin/mdmon ] && dracut_install mdmon
+inst_rules "$moddir/70-mdadm.rules"
+[ -f /etc/mdadm/mdadm.conf ] && inst /etc/mdadm/mdadm.conf "$initdir" /etc/mdadm.conf
+[ -f /etc/mdadm.conf ] && inst /etc/mdadm.conf "$initdir"
+inst_hook pre-pivot 30 "$moddir/mdmon-pre-pivot.sh"
 

modules.d/90mdraid/mdmon-pre-pivot.sh

@@ -0,0 +1,3 @@
+# switch any mdmon instances to newroot
+[ -f /etc/mdadm.conf ] && /sbin/mdmon /proc/mdstat $NEWROOT
+

modules.d/90mdraid/mdraid.sh

@@ -1,8 +0,0 @@
-#!/bin/sh
-mdadm   --assemble 		\
-	--homehost=localhost    \
-	--auto-update-homehost  \
-	--scan 
-
-udevadm settle --timeout=30 
-