diff --git a/xCAT-server/share/xcat/netboot/rh/dracut/xcatroot b/xCAT-server/share/xcat/netboot/rh/dracut/xcatroot
index 900cdad84..b6595b017 100755
--- a/xCAT-server/share/xcat/netboot/rh/dracut/xcatroot
+++ b/xCAT-server/share/xcat/netboot/rh/dracut/xcatroot
@@ -3,6 +3,8 @@ NEWROOT=$3
 RWDIR=.statelite
 XCATMASTER=$XCAT
 
+. /lib/dracut-lib.sh
+rootlimit="$(getarg rootlimit=)"
 if [ ! -z "$imgurl" ]; then
 	if [ xhttp = x${imgurl%%:*} ]; then
 		NFS=0
@@ -41,7 +43,12 @@ if [ -r /rootimg.sfs ]; then
   mount --move /rw $NEWROOT/rw
 elif [ -r /rootimg.gz ]; then
   echo Setting up RAM-root tmpfs.
-  mount -t tmpfs -o mode=755 rootfs $NEWROOT
+  if [ -z $rootlimit ];then
+    mount -t tmpfs -o mode=755 rootfs $NEWROOT
+  else
+    mount -t tmpfs -o mode=755,size=$rootlimit rootfs $NEWROOT
+  fi
+
   cd $NEWROOT
   echo -n "Extracting root filesystem:"
   if [ -x /bin/cpio ]; then
@@ -52,7 +59,13 @@ elif [ -r /rootimg.gz ]; then
   echo Done
 elif [ -r /rootimg-statelite.gz ]; then
   echo Setting up RAM-root tmpfs for statelite mode.
-  mount -t tmpfs -o mode=755 rootfs $NEWROOT
+ 
+  if [ -z $rootlimit];then
+    mount -t tmpfs -o mode=755 rootfs $NEWROOT
+  else
+    mount -t tmpfs -o mode=755,size=$rootlimit rootfs $NEWROOT
+  fi
+
   cd $NEWROOT
   echo -n "Extracting root filesystem:"
   if [ -x /bin/cpio ]; then
diff --git a/xCAT-server/share/xcat/netboot/rh/genimage b/xCAT-server/share/xcat/netboot/rh/genimage
index 539f27c8c..5b2fcc637 100755
--- a/xCAT-server/share/xcat/netboot/rh/genimage
+++ b/xCAT-server/share/xcat/netboot/rh/genimage
@@ -813,9 +813,18 @@ sub mkinitrd_dracut {
         xdie "the mode: $mode is not supported by genimage";
     }
 
-    system("chroot $rootimg_dir dracut -f /tmp/initrd.$$.gz $kernelver");
+    my $additional_options=undef;
+    if($rootlimit)
+    {
+	open(my $ETC_CMDLINE,">","$rootimg_dir/tmp/cmdline");
+	print $ETC_CMDLINE qq{rootlimit=$rootlimit\n};
+	close $ETC_CMDLINE;
+	$additional_options= qq{--include /tmp/cmdline /etc/cmdline};
+    }
+
+    system("chroot $rootimg_dir dracut $additional_options -f /tmp/initrd.$$.gz $kernelver");
     print "the initial ramdisk for $mode is generated successfully.\n";
-    move("$rootimg_dir/tmp/initrd.$$.gz", "$destdir/initrd-$mode.gz");
+    move("$rootimg_dir/tmp/initrd.$$.gz", "$destdir/initrd-$mode.gz"); 
 }
 
 sub mkinitrd {