diff --git a/docs/source/guides/admin-guides/references/man1/packimage.1.rst b/docs/source/guides/admin-guides/references/man1/packimage.1.rst
index d0520af54..20651fbda 100644
--- a/docs/source/guides/admin-guides/references/man1/packimage.1.rst
+++ b/docs/source/guides/admin-guides/references/man1/packimage.1.rst
@@ -64,6 +64,8 @@ OPTIONS
 
 \ **-m**\           Archive Method (cpio,tar,squashfs, default is cpio)
 
+\ **-c**\           Compress Method (pigz,gzip,xz, default is pigz)
+
 
 ************
 RETURN VALUE
diff --git a/xCAT-client/pods/man1/packimage.1.pod b/xCAT-client/pods/man1/packimage.1.pod
index 0fa78542c..60b34fe6f 100644
--- a/xCAT-client/pods/man1/packimage.1.pod
+++ b/xCAT-client/pods/man1/packimage.1.pod
@@ -38,6 +38,8 @@ B<-a>          Architecture (ppc64,x86_64,etc)
 
 B<-m>          Archive Method (cpio,tar,squashfs, default is cpio)
 
+B<-c>          Compress Method (pigz,gzip,xz, default is pigz)
+
 
 =head1 RETURN VALUE
 
diff --git a/xCAT-server/lib/xcat/plugins/anaconda.pm b/xCAT-server/lib/xcat/plugins/anaconda.pm
index a0e9f768d..bb6d1738b 100644
--- a/xCAT-server/lib/xcat/plugins/anaconda.pm
+++ b/xCAT-server/lib/xcat/plugins/anaconda.pm
@@ -462,9 +462,11 @@ sub mknetboot
         }
 
         $platform = xCAT_plugin::anaconda::getplatform($osver);
-        my $suffix = 'gz';
+        my $suffix = 'cpio.gz';
         $suffix = 'sfs' if (-r "$rootimgdir/rootimg.sfs");
-        $suffix = 'tgz' if (-r "$rootimgdir/rootimg.tgz");
+        $suffix = 'cpio.xz' if (-r "$rootimgdir/rootimg.cpio.xz");
+        $suffix = 'tar.gz' if (-r "$rootimgdir/rootimg.tar.gz");
+        $suffix = 'tar.xz' if (-r "$rootimgdir/rootimg.tar.xz");
 
         # statelite images are not packed.
         if ($statelite) {
@@ -513,7 +515,7 @@ sub mknetboot
                     copy("$rootimgdir/initrd.gz", "$rootimgdir/initrd-stateless.gz");
                 }
             }
-            unless (-r "$rootimgdir/rootimg.gz" or -r "$rootimgdir/rootimg.tgz" or -r "$rootimgdir/rootimg.sfs") {
+            unless (-r "$rootimgdir/rootimg.cpio.gz" or -r "$rootimgdir/rootimg.cpio.xz" or -r "$rootimgdir/rootimg.tar.gz" or -r "$rootimgdir/rootimg.tar.xz" or -r "$rootimgdir/rootimg.sfs") {
                 $callback->({
                         error => ["No packed image for platform $osver, architecture $arch, and profile $profile found at $rootimgdir/rootimg.gz or $rootimgdir/rootimg.sfs on $myname, please run packimage (e.g.  packimage -o $osver -p $profile -a $arch"],
                         errorcode => [1] });
diff --git a/xCAT-server/lib/xcat/plugins/debian.pm b/xCAT-server/lib/xcat/plugins/debian.pm
index 5d57bea30..927886864 100644
--- a/xCAT-server/lib/xcat/plugins/debian.pm
+++ b/xCAT-server/lib/xcat/plugins/debian.pm
@@ -1170,9 +1170,10 @@ sub mknetboot
         }
 
         $platform = xCAT_plugin::debian::getplatform($osver);
-        my $suffix = 'gz';
-        $suffix = 'sfs' if (-r "$rootimgdir/rootimg.sfs");
-        $suffix = 'tgz' if (-r "$rootimgdir/rootimg.tgz");
+        my $suffix = 'cpio.gz';
+        $suffix = 'cpio.xz' if (-r "$rootimgdir/rootimg.cpio.xz");
+        $suffix = 'tar.gz' if (-r "$rootimgdir/rootimg.tar.gz");
+        $suffix = 'tar.xz' if (-r "$rootimgdir/rootimg.tar.xz");
 
         # statelite images are not packed.
         if ($statelite) {
@@ -1222,7 +1223,7 @@ sub mknetboot
                     copy("$rootimgdir/initrd.gz", "$rootimgdir/initrd-stateless.gz");
                 }
             }
-            unless (-r "$rootimgdir/rootimg.gz" or -r "$rootimgdir/rootimg.tgz" or -r "$rootimgdir/rootimg.sfs") {
+            unless (-r "$rootimgdir/rootimg.cpio.gz" or -r "$rootimgdir/rootimg.cpio.xz" or -r "$rootimgdir/rootimg.tar.gz" or -r "$rootimgdir/rootimg.tar.xz" or -r "$rootimgdir/rootimg.sfs") {
                 $callback->({
                         error => ["No packed image for platform $osver, architecture $arch, and profile $profile, please run packimage (e.g.  packimage -o $osver -p $profile -a $arch"],
                         errorcode => [1] });
diff --git a/xCAT-server/lib/xcat/plugins/packimage.pm b/xCAT-server/lib/xcat/plugins/packimage.pm
index 6d6518df7..ca92c8f37 100755
--- a/xCAT-server/lib/xcat/plugins/packimage.pm
+++ b/xCAT-server/lib/xcat/plugins/packimage.pm
@@ -87,6 +87,7 @@ sub process_request {
     my $arch;
     my $profile;
     my $method = 'cpio';
+    my $compress;
     my $exlistloc;
     my $syncfile;
     my $rootimg_dir;
@@ -102,6 +103,7 @@ sub process_request {
         "arch|a=s"    => \$arch,
         "osver|o=s"   => \$osver,
         "method|m=s"  => \$method,
+        "compress|c=s"  => \$compress,
         "tracker=s"   => \$dotorrent,
         "help|h"      => \$help,
         "version|v"   => \$version
@@ -419,51 +421,77 @@ sub process_request {
     unlink("$destdir/rootimg.gz");
     unlink("$destdir/rootimg.sfs");
 
-    $callback->({ info => ["archive method:$method"] });
-    if ($method =~ /cpio/) {
-        my $compress = "gzip";
-
-        #use "pigz" as the compress tool instead of gzip if "pigz" exist
-        my $ispigz = system("bash -c 'type -p pigz' >/dev/null 2>&1");
-        if ($ispigz == 0) {
-            $compress = "pigz";
-        }
-        $callback->({ info => ["compress method:$compress"] });
-        if (!$exlistloc) {
-            $excludestr = "find . -xdev -print0 | cpio -H newc -o -0 | $compress -c - > ../rootimg.gz";
-        } else {
-            chdir("$rootimg_dir");
-            system("$excludestr >> $xcat_packimg_tmpfile");
-            if ($includestr) {
-                system("$includestr >> $xcat_packimg_tmpfile");
+    my $suffix;
+    if ($compress) {
+        if ($compress eq 'gzip') {
+            my $isgzip = system("bash -c 'type -p gzip' >/dev/null 2>&1");
+            unless ($isgzip == 0) {
+                $callback->({ error => ["Command gzip does not exist, please make sure it is installed."] });
+                return 1;
             }
-            $excludestr = "cat $xcat_packimg_tmpfile|cpio -H newc -o | $compress -c - > ../rootimg.gz";
+            $suffix = "gz";
+        } elsif ($compress eq 'pigz') {
+            my $ispigz = system("bash -c 'type -p pigz' >/dev/null 2>&1");
+            unless ($ispigz == 0) {
+                $callback->({ error => ["Command pigz does not exist, please make sure it is installed."] });
+                return 1;
+            }
+            $suffix = "gz";
+        } elsif ($compress eq 'xz') {
+            my $isxz = system("bash -c 'type -p xz' >/dev/null 2>&1");
+            unless ($isxz == 0) {
+                $callback->({ error => ["Command xz does not exist, please make sure it is installed."] });
+                return 1;
+            }
+            $suffix = "xz";
+        } else {
+            $callback->({ error => ["Invalid compress method '$compress' requested"], errorcode => [1] });
+            return 1;
         }
-        $oldmask = umask 0077;
-    } elsif ($method =~ /tar/) {
-        my $compress = "gzip";
-
-        #use "pigz" as the compress tool instead of gzip if "pigz" exist
+    } else {
         my $ispigz = system("bash -c 'type -p pigz' >/dev/null 2>&1");
         if ($ispigz == 0) {
             $compress = "pigz";
         } else {
             my $isgzip = system("bash -c 'type -p gzip' >/dev/null 2>&1");
-            unless ($isgzip == 0) {
-                $callback->({ error => ["Command gzip does not exist, please make sure it works."] });
+            if ($isgzip == 0) {
+                $compress = "gzip";
+            } else {
+                $callback->({ error => ["The default compress tool 'gzip' and 'pigz' does not exist, please specify an available compress method with '-c'."] });
                 return 1;
             }
         }
+        $suffix = "gz";
+    }
+
+    $callback->({ info => ["archive method:$method"] });
+    unless ($method =~ /squashfs/) {
         $callback->({ info => ["compress method:$compress"] });
+    }
+
+    $suffix = $method.".".$suffix;
+    if ($method =~ /cpio/) {
         if (!$exlistloc) {
-            $excludestr = "find . -xdev -print0 | tar --selinux --xattrs-include='*' --null -T - -c | $compress -c - > ../rootimg.tgz";
+            $excludestr = "find . -xdev -print0 | cpio -H newc -o -0 | $compress -c - > ../rootimg.$suffix";
         } else {
             chdir("$rootimg_dir");
             system("$excludestr >> $xcat_packimg_tmpfile");
             if ($includestr) {
                 system("$includestr >> $xcat_packimg_tmpfile");
             }
-            $excludestr = "cat $xcat_packimg_tmpfile| tar --selinux --xattrs-include='*' -T - -c | $compress -c - > ../rootimg.tgz";
+            $excludestr = "cat $xcat_packimg_tmpfile|cpio -H newc -o | $compress -c - > ../rootimg.$suffix";
+        }
+        $oldmask = umask 0077;
+    } elsif ($method =~ /tar/) {
+        if (!$exlistloc) {
+            $excludestr = "find . -xdev -print0 | tar --selinux --xattrs-include='*' --null -T - -c | $compress -c - > ../rootimg.$suffix";
+        } else {
+            chdir("$rootimg_dir");
+            system("$excludestr >> $xcat_packimg_tmpfile");
+            if ($includestr) {
+                system("$includestr >> $xcat_packimg_tmpfile");
+            }
+            $excludestr = "cat $xcat_packimg_tmpfile| tar --selinux --xattrs-include='*' -T - -c | $compress -c - > ../rootimg.$suffix";
         }
         $oldmask = umask 0077;
     } elsif ($method =~ /squashfs/) {
@@ -476,24 +504,25 @@ sub process_request {
         }
         $excludestr = "cat $xcat_packimg_tmpfile|cpio -dump $temppath";
     } else {
-        $callback->({ error => ["Invalid method '$method' requested"], errorcode => [1] });
+        $callback->({ error => ["Invalid archive method '$method' requested"], errorcode => [1] });
+        return 1;
     }
     chdir("$rootimg_dir");
     my $outputmsg = `$excludestr`;
     $callback->({ info => ["$outputmsg"] });
     if ($method =~ /cpio/) {
-        chmod 0644, "$destdir/rootimg.gz";
+        chmod 0644, "$destdir/rootimg.$suffix";
         if ($dotorrent) {
             my $currdir = getcwd;
             chdir($destdir);
-            unlink("rootimg.gz.metainfo");
-            system("ctorrent -t -u $dotorrent -l 1048576 -s rootimg.gz.metainfo rootimg.gz");
-            chmod 0644, "rootimg.gz.metainfo";
+            unlink("rootimg.$suffix.metainfo");
+            system("ctorrent -t -u $dotorrent -l 1048576 -s rootimg.$suffix.metainfo rootimg.$suffix");
+            chmod 0644, "rootimg.$suffix.metainfo";
             chdir($currdir);
         }
         umask $oldmask;
     } elsif ($method =~ /tar/) {
-        chmod 0644, "$destdir/rootimg.tgz";
+        chmod 0644, "$destdir/rootimg.$suffix";
         umask $oldmask;
     } elsif ($method =~ /squashfs/) {
         my $flags;
diff --git a/xCAT-server/lib/xcat/plugins/sles.pm b/xCAT-server/lib/xcat/plugins/sles.pm
index a833353ea..7429da3cf 100644
--- a/xCAT-server/lib/xcat/plugins/sles.pm
+++ b/xCAT-server/lib/xcat/plugins/sles.pm
@@ -327,9 +327,11 @@ sub mknetboot
             $platform = "sles";
         }
 
-        my $suffix = 'gz';
+        my $suffix = 'cpio.gz';
         $suffix = 'sfs' if (-r "$rootimgdir/rootimg.sfs");
-        $suffix = 'tgz' if (-r "$rootimgdir/rootimg.tgz");
+        $suffix = 'cpio.xz' if (-r "$rootimgdir/rootimg.cpio.xz");
+        $suffix = 'tar.gz' if (-r "$rootimgdir/rootimg.tar.gz");
+        $suffix = 'tar.xz' if (-r "$rootimgdir/rootimg.tar.xz");
 
         if ($statelite) {
             unless (-r "$rootimgdir/kernel") {
@@ -381,7 +383,7 @@ sub mknetboot
                 }
             }
 
-            unless (-r "$rootimgdir/rootimg.gz" or -r "$rootimgdir/rootimg.tgz" or -r "$rootimgdir/rootimg.sfs") {
+            unless (-r "$rootimgdir/rootimg.cpio.gz" or -r "$rootimgdir/rootimg.cpio.xz" or -r "$rootimgdir/rootimg.tar.gz" or -r "$rootimgdir/rootimg.tar.xz" or -r "$rootimgdir/rootimg.sfs") {
                 $callback->({
                         error => [qq{No packed image for platform $osver, architecture $arch, and profile $profile, please run packimage before nodeset}],
                         errorcode => [1]
diff --git a/xCAT-server/share/xcat/netboot/rh/compute.pkglist b/xCAT-server/share/xcat/netboot/rh/compute.pkglist
index 2824c79fc..42f78c8a2 100644
--- a/xCAT-server/share/xcat/netboot/rh/compute.pkglist
+++ b/xCAT-server/share/xcat/netboot/rh/compute.pkglist
@@ -14,3 +14,4 @@ rpm
 rsync
 tar
 gzip
+xz
diff --git a/xCAT-server/share/xcat/netboot/rh/compute.rhels6.pkglist b/xCAT-server/share/xcat/netboot/rh/compute.rhels6.pkglist
index e2389d3de..c5eaece65 100644
--- a/xCAT-server/share/xcat/netboot/rh/compute.rhels6.pkglist
+++ b/xCAT-server/share/xcat/netboot/rh/compute.rhels6.pkglist
@@ -15,3 +15,4 @@ rsyslog
 e2fsprogs
 gzip
 tar
+xz
diff --git a/xCAT-server/share/xcat/netboot/rh/compute.rhels6.ppc64.pkglist b/xCAT-server/share/xcat/netboot/rh/compute.rhels6.ppc64.pkglist
index fbaf36a2a..1439425ef 100644
--- a/xCAT-server/share/xcat/netboot/rh/compute.rhels6.ppc64.pkglist
+++ b/xCAT-server/share/xcat/netboot/rh/compute.rhels6.ppc64.pkglist
@@ -26,3 +26,4 @@ procps
 parted
 gzip
 tar
+xz
diff --git a/xCAT-server/share/xcat/netboot/rh/compute.rhels6.x86_64.pkglist b/xCAT-server/share/xcat/netboot/rh/compute.rhels6.x86_64.pkglist
index ae873e99f..24c092e95 100644
--- a/xCAT-server/share/xcat/netboot/rh/compute.rhels6.x86_64.pkglist
+++ b/xCAT-server/share/xcat/netboot/rh/compute.rhels6.x86_64.pkglist
@@ -22,3 +22,4 @@ e2fsprogs
 parted
 gzip
 tar
+xz
diff --git a/xCAT-server/share/xcat/netboot/rh/compute.rhels7.ppc64.pkglist b/xCAT-server/share/xcat/netboot/rh/compute.rhels7.ppc64.pkglist
index bb9af2ce9..2a7c348d3 100644
--- a/xCAT-server/share/xcat/netboot/rh/compute.rhels7.ppc64.pkglist
+++ b/xCAT-server/share/xcat/netboot/rh/compute.rhels7.ppc64.pkglist
@@ -26,3 +26,4 @@ parted
 net-tools
 gzip
 tar
+xz
diff --git a/xCAT-server/share/xcat/netboot/rh/compute.rhels7.x86_64.pkglist b/xCAT-server/share/xcat/netboot/rh/compute.rhels7.x86_64.pkglist
index 3c54123a8..e0dede612 100644
--- a/xCAT-server/share/xcat/netboot/rh/compute.rhels7.x86_64.pkglist
+++ b/xCAT-server/share/xcat/netboot/rh/compute.rhels7.x86_64.pkglist
@@ -21,3 +21,4 @@ parted
 net-tools
 gzip
 tar
+xz
diff --git a/xCAT-server/share/xcat/netboot/rh/dracut/install.netboot b/xCAT-server/share/xcat/netboot/rh/dracut/install.netboot
index f14ffa1c0..0b19df672 100755
--- a/xCAT-server/share/xcat/netboot/rh/dracut/install.netboot
+++ b/xCAT-server/share/xcat/netboot/rh/dracut/install.netboot
@@ -1,6 +1,6 @@
 #!/bin/sh
 echo $drivers
-dracut_install wget tar cpio gzip dash modprobe touch echo cut wc
+dracut_install wget tar cpio gzip dash modprobe touch echo cut wc xz
 dracut_install -o ctorrent
 dracut_install grep ifconfig hostname awk egrep grep dirname expr
 dracut_install mount.nfs
diff --git a/xCAT-server/share/xcat/netboot/rh/dracut/xcatroot b/xCAT-server/share/xcat/netboot/rh/dracut/xcatroot
index 688d7f772..4d20531fa 100755
--- a/xCAT-server/share/xcat/netboot/rh/dracut/xcatroot
+++ b/xCAT-server/share/xcat/netboot/rh/dracut/xcatroot
@@ -67,8 +67,8 @@ if [ -r /rootimg.sfs ]; then
   mkdir -p $NEWROOT/rw
   mount --move /ro $NEWROOT/ro
   mount --move /rw $NEWROOT/rw
-elif [ -r /rootimg.gz ]; then
-  [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "rootimg.gz downloaded,setting up RAM-root tmpfs...."
+elif [ -r /rootimg.cpio.gz ] || [ -r /rootimg.cpio.xz ]; then
+  [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "rootimg downloaded,setting up RAM-root tmpfs...."
   echo Setting up RAM-root tmpfs.
   if [ -z $rootlimit ];then
     mount -t tmpfs -o mode=755 rootfs $NEWROOT
@@ -79,15 +79,23 @@ elif [ -r /rootimg.gz ]; then
   cd $NEWROOT
   [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "Extracting root filesystem:"
   echo -n "Extracting root filesystem:"
-  if [ -x /bin/cpio ]; then
-    gzip -cd /rootimg.gz |/bin/cpio -idum
-  else
-    gzip -cd /rootimg.gz |cpio -idum
+  if [ -r /rootimg.cpio.gz ]; then
+    if [ -x /bin/cpio ]; then
+      gzip -cd /rootimg.cpio.gz |/bin/cpio -idum
+    else
+      gzip -cd /rootimg.cpio.gz |cpio -idum
+    fi
+  elif [ -r /rootimg.cpio.xz ]; then
+    if [ -x /bin/cpio ]; then
+      xz -cd /rootimg.cpio.xz |/bin/cpio -idum
+    else
+      xz -cd /rootimg.cpio.xz |cpio -idum
+    fi
   fi
   $NEWROOT/etc/init.d/localdisk
   [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "Done...."
   echo Done
-elif [ -r /rootimg.tgz ]; then
+elif [ -r /rootimg.tar.gz ] || [ -r /rootimg.tar.xz ]; then
   echo Setting up RAM-root tmpfs.
   if [ -z $rootlimit ];then
     mount -t tmpfs -o mode=755 rootfs $NEWROOT
@@ -97,7 +105,11 @@ elif [ -r /rootimg.tgz ]; then
 
   cd $NEWROOT
   echo -n "Extracting root filesystem:"
-  tar --selinux --xattrs-include='*' -zxvf /rootimg.tgz
+  if [ -r /rootimg.tar.gz ]; then
+    tar --selinux --xattrs-include='*' -zxvf /rootimg.tar.gz
+  elif [ -r /rootimg.tar.xz ]; then
+    tar --selinux --xattrs-include='*' -Jxvf /rootimg.tar.xz
+  fi
   $NEWROOT/etc/init.d/localdisk
   echo Done
 elif [ -r /rootimg-statelite.gz ]; then
diff --git a/xCAT-server/share/xcat/netboot/rh/dracut_033/install.netboot b/xCAT-server/share/xcat/netboot/rh/dracut_033/install.netboot
index e1227868b..cca462a0b 100755
--- a/xCAT-server/share/xcat/netboot/rh/dracut_033/install.netboot
+++ b/xCAT-server/share/xcat/netboot/rh/dracut_033/install.netboot
@@ -1,6 +1,6 @@
 #!/bin/sh
 echo $drivers
-dracut_install wget tar cpio gzip modprobe touch echo cut wc
+dracut_install wget tar cpio gzip modprobe touch echo cut wc xz
 dracut_install grep ifconfig hostname awk egrep grep dirname expr
 dracut_install mount.nfs
 dracut_install parted mke2fs bc mkswap swapon chmod
diff --git a/xCAT-server/share/xcat/netboot/rh/dracut_033/xcatroot b/xCAT-server/share/xcat/netboot/rh/dracut_033/xcatroot
index 328068a32..0bc2ebcd9 100755
--- a/xCAT-server/share/xcat/netboot/rh/dracut_033/xcatroot
+++ b/xCAT-server/share/xcat/netboot/rh/dracut_033/xcatroot
@@ -69,8 +69,8 @@ if [ -r /rootimg.sfs ]; then
   mkdir -p $NEWROOT/rw
   mount --move /ro $NEWROOT/ro
   mount --move /rw $NEWROOT/rw
-elif [ -r /rootimg.gz ]; then
-  [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "rootimg.gz downloaded,setting up RAM-root tmpfs...."
+elif [ -r /rootimg.cpio.gz ] || [ -r /rootimg.cpio.xz ]; then
+  [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "rootimg downloaded,setting up RAM-root tmpfs...."
   echo Setting up RAM-root tmpfs.
   if [ -z $rootlimit ];then
     mount -t tmpfs -o mode=755 rootfs $NEWROOT
@@ -81,16 +81,24 @@ elif [ -r /rootimg.gz ]; then
   cd $NEWROOT
   [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "Extracting root filesystem:"
   echo -n "Extracting root filesystem:"
-  if [ -x /bin/cpio ]; then
-    gzip -cd /rootimg.gz |/bin/cpio -idum
-  else
-    gzip -cd /rootimg.gz |cpio -idum
+  if [ -r /rootimg.cpio.gz ]; then
+    if [ -x /bin/cpio ]; then
+      gzip -cd /rootimg.cpio.gz |/bin/cpio -idum
+    else
+      gzip -cd /rootimg.cpio.gz |cpio -idum
+    fi
+  elif [ -r /rootimg.cpio.xz ]; then
+    if [ -x /bin/cpio ]; then
+      xz -cd /rootimg.cpio.xz |/bin/cpio -idum
+    else
+      xz -cd /rootimg.cpio.xz |cpio -idum
+    fi
   fi
   $NEWROOT/etc/init.d/localdisk
   [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "Done...."
   echo Done
-elif [ -r /rootimg.tgz ]; then
-  [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "rootimg.tgz downloaded,setting up RAM-root tmpfs...."
+elif [ -r /rootimg.tar.gz ] || [ -r /rootimg.tar.xz ]; then
+  [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "rootimg downloaded,setting up RAM-root tmpfs...."
   echo Setting up RAM-root tmpfs.
   if [ -z $rootlimit ];then
     mount -t tmpfs -o mode=755 rootfs $NEWROOT
@@ -101,7 +109,11 @@ elif [ -r /rootimg.tgz ]; then
   cd $NEWROOT
   [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "Extracting root filesystem:"
   echo -n "Extracting root filesystem:"
-  tar --selinux --xattrs-include='*' -zxvf /rootimg.tgz
+  if [ -r /rootimg.tar.gz ]; then
+    tar --selinux --xattrs-include='*' -zxvf /rootimg.tar.gz
+  elif [ -r /rootimg.tar.xz ]; then
+    tar --selinux --xattrs-include='*' -Jxvf /rootimg.tar.xz
+  fi
   $NEWROOT/etc/init.d/localdisk
   [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "Done...."
   echo Done
diff --git a/xCAT-server/share/xcat/netboot/rh/genimage b/xCAT-server/share/xcat/netboot/rh/genimage
index 0879cabb9..aa13d2855 100755
--- a/xCAT-server/share/xcat/netboot/rh/genimage
+++ b/xCAT-server/share/xcat/netboot/rh/genimage
@@ -1606,7 +1606,7 @@ if [ -r /rootimg.sfs ]; then
   mount --move /ro \$NEWROOT/ro
   mount --move /rw \$NEWROOT/rw
 EOMS
-    print $inifile "elif [ -r /rootimg.gz ]; then\n";
+    print $inifile "elif [ -r /rootimg.cpio.gz ] || [ -r /rootimg.cpio.xz ]; then\n";
     print $inifile "echo Setting up RAM-root tmpfs.\n";
     if ($rootlimit) {
         print $inifile "  mount -o size=$rootlimit,mode=755 -t tmpfs rootfs \$NEWROOT\n";
@@ -1615,13 +1615,21 @@ EOMS
     }
     print $inifile "  cd \$NEWROOT\n";
     print $inifile "  echo -n \"Extracting root filesystem:\"\n";
-    print $inifile "  if [ -x /bin/cpio ]; then\n";
-    print $inifile "  zcat /rootimg.gz |/bin/cpio -idum\n";
-    print $inifile "  else\n";
-    print $inifile "  zcat /rootimg.gz |cpio -idum\n";
+    print $inifile "  if [ -r /rootimg.cpio.gz ]; then\n";
+    print $inifile "    if [ -x /bin/cpio ]; then\n";
+    print $inifile "      zcat /rootimg.cpio.gz |/bin/cpio -idum\n";
+    print $inifile "    else\n";
+    print $inifile "      zcat /rootimg.cpio.gz |cpio -idum\n";
+    print $inifile "    fi\n";
+    print $inifile "  elif [ -r /rootimg.cpio.xz ]; then\n";
+    print $inifile "    if [ -x /bin/cpio ]; then\n";
+    print $inifile "      xz -cd /rootimg.cpio.xz |/bin/cpio -idum\n";
+    print $inifile "    else\n";
+    print $inifile "      xz -cd /rootimg.cpio.xz |cpio -idum\n";
+    print $inifile "    fi\n";
     print $inifile "  fi\n";
     print $inifile "  echo Done\n";
-    print $inifile "elif [ -r /rootimg.tgz ]; then\n";
+    print $inifile "elif [ -r /rootimg.tar.gz ] || [ -r /rootimg.tar.xz ]; then\n";
     print $inifile "    echo Setting up RAM-root tmpfs.\n";
 
     if ($rootlimit) {
@@ -1631,7 +1639,11 @@ EOMS
     }
     print $inifile "    cd \$NEWROOT\n";
     print $inifile "    echo -n \"Extracting root filesystem:\"\n";
-    print $inifile "    tar --selinux --xattrs-include='*' -zxvf /rootimg.tgz\n";
+    print $inifile "    if [ -r /rootimg.tar.gz ]; then\n";
+    print $inifile "        tar --selinux --xattrs-include='*' -zxvf /rootimg.tar.gz\n";
+    print $inifile "    elif [ -r /rootimg.tar.xz ]; then\n";
+    print $inifile "        tar --selinux --xattrs-include='*' -Jxvf /rootimg.tar.xz\n";
+    print $inifile "    fi\n";
     print $inifile "    echo Done\n";
     print $inifile "else\n";
     print $inifile "  echo -n Failed to download image, panicing in 5...\n";
@@ -1708,7 +1720,7 @@ EOMS
     }
 
     # add rsync for statelite
-    foreach ("bin/cpio", "sbin/nash", "sbin/busybox.anaconda", "sbin/rmmod", "bin/bash", "usr/sbin/chroot", "sbin/mount.nfs", "usr/bin/rsync", "usr/bin/wc", "usr/bin/gzip", "usr/bin/tar") {
+    foreach ("bin/cpio", "sbin/nash", "sbin/busybox.anaconda", "sbin/rmmod", "bin/bash", "usr/sbin/chroot", "sbin/mount.nfs", "usr/bin/rsync", "usr/bin/wc", "usr/bin/xz", "usr/bin/gzip", "usr/bin/tar") {
         getlibs($_);
         push @filestoadd, $_;
     }
diff --git a/xCAT-server/share/xcat/netboot/sles/compute.pkglist b/xCAT-server/share/xcat/netboot/sles/compute.pkglist
index cc5a5fd87..a3165f834 100644
--- a/xCAT-server/share/xcat/netboot/sles/compute.pkglist
+++ b/xCAT-server/share/xcat/netboot/sles/compute.pkglist
@@ -13,3 +13,4 @@ timezone
 ntp
 tar
 gzip
+xz
diff --git a/xCAT-server/share/xcat/netboot/sles/compute.sles11.pkglist b/xCAT-server/share/xcat/netboot/sles/compute.sles11.pkglist
index e284622f1..8787c0177 100644
--- a/xCAT-server/share/xcat/netboot/sles/compute.sles11.pkglist
+++ b/xCAT-server/share/xcat/netboot/sles/compute.sles11.pkglist
@@ -19,3 +19,4 @@ bc
 ntp
 gzip
 tar
+xz
diff --git a/xCAT-server/share/xcat/netboot/sles/compute.sles11.ppc64.pkglist b/xCAT-server/share/xcat/netboot/sles/compute.sles11.ppc64.pkglist
index 26e735587..3f9ffbed3 100644
--- a/xCAT-server/share/xcat/netboot/sles/compute.sles11.ppc64.pkglist
+++ b/xCAT-server/share/xcat/netboot/sles/compute.sles11.ppc64.pkglist
@@ -21,3 +21,4 @@ procps
 ntp
 gzip
 tar
+xz
diff --git a/xCAT-server/share/xcat/netboot/sles/compute.sles12.ppc64le.pkglist b/xCAT-server/share/xcat/netboot/sles/compute.sles12.ppc64le.pkglist
index 1eebf1414..d0b4c3a0e 100644
--- a/xCAT-server/share/xcat/netboot/sles/compute.sles12.ppc64le.pkglist
+++ b/xCAT-server/share/xcat/netboot/sles/compute.sles12.ppc64le.pkglist
@@ -41,3 +41,4 @@ udev
 kernel-default
 kernel-firmware
 adaptec-firmware
+xz
diff --git a/xCAT-server/share/xcat/netboot/sles/compute.sles12.x86_64.pkglist b/xCAT-server/share/xcat/netboot/sles/compute.sles12.x86_64.pkglist
index 1eebf1414..d0b4c3a0e 100644
--- a/xCAT-server/share/xcat/netboot/sles/compute.sles12.x86_64.pkglist
+++ b/xCAT-server/share/xcat/netboot/sles/compute.sles12.x86_64.pkglist
@@ -41,3 +41,4 @@ udev
 kernel-default
 kernel-firmware
 adaptec-firmware
+xz
diff --git a/xCAT-server/share/xcat/netboot/sles/dracut_033/install.netboot b/xCAT-server/share/xcat/netboot/sles/dracut_033/install.netboot
index e1227868b..cca462a0b 100755
--- a/xCAT-server/share/xcat/netboot/sles/dracut_033/install.netboot
+++ b/xCAT-server/share/xcat/netboot/sles/dracut_033/install.netboot
@@ -1,6 +1,6 @@
 #!/bin/sh
 echo $drivers
-dracut_install wget tar cpio gzip modprobe touch echo cut wc
+dracut_install wget tar cpio gzip modprobe touch echo cut wc xz
 dracut_install grep ifconfig hostname awk egrep grep dirname expr
 dracut_install mount.nfs
 dracut_install parted mke2fs bc mkswap swapon chmod
diff --git a/xCAT-server/share/xcat/netboot/sles/dracut_033/xcatroot b/xCAT-server/share/xcat/netboot/sles/dracut_033/xcatroot
index 91b6a3aa4..acd7b3ebf 100755
--- a/xCAT-server/share/xcat/netboot/sles/dracut_033/xcatroot
+++ b/xCAT-server/share/xcat/netboot/sles/dracut_033/xcatroot
@@ -67,8 +67,8 @@ if [ -r /rootimg.sfs ]; then
   mkdir -p $NEWROOT/rw
   mount --move /ro $NEWROOT/ro
   mount --move /rw $NEWROOT/rw
-elif [ -r /rootimg.gz ]; then
-  [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "rootimg.gz downloaded,setting up RAM-root tmpfs...."
+elif [ -r /rootimg.cpio.gz ] || [ -r /rootimg.cpio.xz ]; then
+  [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "rootimg downloaded,setting up RAM-root tmpfs...."
   echo Setting up RAM-root tmpfs.
   if [ -z $rootlimit ];then
     mount -t tmpfs -o mode=755 rootfs $NEWROOT
@@ -79,16 +79,24 @@ elif [ -r /rootimg.gz ]; then
   cd $NEWROOT
   [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "Extracting root filesystem:"
   echo -n "Extracting root filesystem:"
-  if [ -x /bin/cpio ]; then
-    gzip -cd /rootimg.gz |/bin/cpio -idum
-  else
-    gzip -cd /rootimg.gz |cpio -idum
+  if [ -r /rootimg.cpio.gz ]; then
+    if [ -x /bin/cpio ]; then
+      gzip -cd /rootimg.cpio.gz |/bin/cpio -idum
+    else
+      gzip -cd /rootimg.cpio.gz |cpio -idum
+    fi
+  elif [ -r /rootimg.cpio.xz ]; then
+    if [ -x /bin/cpio ]; then
+      xz -cd /rootimg.cpio.xz |/bin/cpio -idum
+    else
+      xz -cd /rootimg.cpio.xz |cpio -idum
+    fi
   fi
   $NEWROOT/etc/init.d/localdisk
   [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "Done...."
   echo Done
-elif [ -r /rootimg.tgz ]; then
-  [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "rootimg.tgz downloaded,setting up RAM-root tmpfs...."
+elif [ -r /rootimg.tar.gz ] || [ -r /rootimg.tar.xz ]; then
+  [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "rootimg downloaded,setting up RAM-root tmpfs...."
   echo Setting up RAM-root tmpfs.
   if [ -z $rootlimit ];then
     mount -t tmpfs -o mode=755 rootfs $NEWROOT
@@ -99,7 +107,11 @@ elif [ -r /rootimg.tgz ]; then
   cd $NEWROOT
   [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "Extracting root filesystem:"
   echo -n "Extracting root filesystem:"
-  tar --selinux --xattrs-include='*' -zxvf /rootimg.tgz
+  if [ -r /rootimg.tar.gz ]; then
+    tar --selinux --xattrs-include='*' -zxvf /rootimg.tar.gz
+  elif [ -r /rootimg.tar.xz ]; then
+    tar --selinux --xattrs-include='*' -Jxvf /rootimg.tar.xz
+  fi
   $NEWROOT/etc/init.d/localdisk
   [ "$xcatdebugmode" > "0" ] && logger -t xcat -p debug "Done...."
   echo Done
diff --git a/xCAT-server/share/xcat/netboot/sles/genimage b/xCAT-server/share/xcat/netboot/sles/genimage
index 5b894e37a..3fbe3c6c2 100755
--- a/xCAT-server/share/xcat/netboot/sles/genimage
+++ b/xCAT-server/share/xcat/netboot/sles/genimage
@@ -1624,7 +1624,7 @@ if [ -r /rootimg.sfs ]; then
   mount --move /ro /sysroot/ro
   mount --move /rw /sysroot/rw
 EOMS
-    print $inifile "elif [ -r /rootimg.gz ]; then\n";
+    print $inifile "elif [ -r /rootimg.cpio.gz ] || [ -r /rootimg.cpio.xz ]; then\n";
     print $inifile "echo Setting up RAM-root tmpfs.\n";
     if ($rootlimit) {
         print $inifile "  mount -o size=$rootlimit,mode=755 -t tmpfs rootfs \$NEWROOT\n";
@@ -1633,13 +1633,21 @@ EOMS
     }
     print $inifile "  cd /sysroot\n";
     print $inifile "  echo -n \"Extracting root filesystem:\"\n";
-    print $inifile "  if [ -x /bin/cpio ]; then\n";
-    print $inifile "  zcat /rootimg.gz |/bin/cpio -idum\n";
-    print $inifile "  else\n";
-    print $inifile "  zcat /rootimg.gz |cpio -idum\n";
+    print $inifile "  if [ -r /rootimg.cpio.gz ]; then\n";
+    print $inifile "    if [ -x /bin/cpio ]; then\n";
+    print $inifile "      zcat /rootimg.cpio.gz |/bin/cpio -idum\n";
+    print $inifile "    else\n";
+    print $inifile "      zcat /rootimg.cpio.gz |cpio -idum\n";
+    print $inifile "    fi\n";
+    print $inifile "  elif [ -r /rootimg.cpio.xz ]; then\n";
+    print $inifile "    if [ -x /bin/cpio ]; then\n";
+    print $inifile "      xz -cd /rootimg.cpio.xz |/bin/cpio -idum\n";
+    print $inifile "    else\n";
+    print $inifile "      xz -cd /rootimg.cpio.xz |cpio -idum\n";
+    print $inifile "    fi\n";
     print $inifile "  fi\n";
     print $inifile "  echo Done\n";
-    print $inifile "elif [ -r /rootimg.tgz ]; then\n";
+    print $inifile "elif [ -r /rootimg.tar.gz ] || [ -r /rootimg.tar.xz ]; then\n";
     print $inifile "    echo Setting up RAM-root tmpfs.\n";
 
     if ($rootlimit) {
@@ -1649,7 +1657,11 @@ EOMS
     }
     print $inifile "    cd \$NEWROOT\n";
     print $inifile "    echo -n \"Extracting root filesystem:\"\n";
-    print $inifile "    tar --selinux --xattrs-include='*' -zxvf /rootimg.tgz\n";
+    print $inifile "    if [ -r /rootimg.tar.gz ]; then\n";
+    print $inifile "        tar --selinux --xattrs-include='*' -zxvf /rootimg.tar.gz\n";
+    print $inifile "    elif [ -r /rootimg.tar.xz ]; then\n";
+    print $inifile "        tar --selinux --xattrs-include='*' -Jxvf /rootimg.tar.xz\n";
+    print $inifile "    fi\n";
     print $inifile "    echo Done\n";
     print $inifile "else\n";
     print $inifile "  echo -n Failed to download image, panicing in 5...\n";
@@ -1758,7 +1770,7 @@ EOMS
         }
     }
     if ($mode eq "statelite") {
-        foreach ("sbin/ifconfig", "usr/bin/clear", "usr/bin/touch", "bin/hostname", "usr/bin/egrep", "bin/ln", "bin/ls", "usr/bin/dirname", "usr/bin/expr", "usr/bin/chroot", "usr/bin/grep", "bin/cpio", "bin/sleep", "bin/mount", "bin/umount", "sbin/dhcpcd", "bin/bash", "sbin/insmod", "bin/mkdir", "bin/mknod", "sbin/ip", "bin/cat", "usr/bin/awk", "usr/bin/wget", "bin/cp", "usr/bin/cpio", "usr/bin/zcat", "usr/bin/gzip", "lib/mkinitrd/bin/run-init", "usr/bin/uniq", "usr/bin/sed", "usr/bin/wc", "bin/sed", "sbin/udevd", "usr/bin/readlink", "usr/sbin/parted", "sbin/mke2fs", "sbin/mkswap", "sbin/swapon", "bin/chmod", "usr/bin/bc", "usr/bin/gzip", "usr/bin/tar") {
+        foreach ("sbin/ifconfig", "usr/bin/clear", "usr/bin/touch", "bin/hostname", "usr/bin/egrep", "bin/ln", "bin/ls", "usr/bin/dirname", "usr/bin/expr", "usr/bin/chroot", "usr/bin/grep", "bin/cpio", "bin/sleep", "bin/mount", "bin/umount", "sbin/dhcpcd", "bin/bash", "sbin/insmod", "bin/mkdir", "bin/mknod", "sbin/ip", "bin/cat", "usr/bin/awk", "usr/bin/wget", "bin/cp", "usr/bin/cpio", "usr/bin/zcat", "usr/bin/gzip", "lib/mkinitrd/bin/run-init", "usr/bin/uniq", "usr/bin/sed", "usr/bin/wc", "bin/sed", "sbin/udevd", "usr/bin/readlink", "usr/sbin/parted", "sbin/mke2fs", "sbin/mkswap", "sbin/swapon", "bin/chmod", "usr/bin/bc", "usr/bin/xz", "usr/bin/gzip", "usr/bin/tar") {
             getlibs($_);
             push @filestoadd, $_;
         }
@@ -1770,7 +1782,7 @@ EOMS
         }
 
     } else {
-        foreach ("sbin/ifconfig", "usr/bin/clear", "usr/bin/touch", "usr/bin/grep", "usr/bin/egrep", "bin/cpio", "bin/sleep", "bin/mount", "sbin/dhcpcd", "bin/bash", "sbin/insmod", "bin/mkdir", "bin/mknod", "sbin/ip", "bin/cat", "usr/bin/awk", "usr/bin/wget", "bin/cp", "usr/bin/cpio", "usr/bin/zcat", "usr/bin/gzip", "lib/mkinitrd/bin/run-init", "usr/bin/uniq", "usr/bin/sed", "sbin/udevd", "usr/bin/readlink", "usr/bin/expr", "usr/sbin/parted", "sbin/mke2fs", "sbin/mkswap", "sbin/swapon", "bin/chmod", "usr/bin/bc", "usr/bin/gzip", "usr/bin/tar") {
+        foreach ("sbin/ifconfig", "usr/bin/clear", "usr/bin/touch", "usr/bin/grep", "usr/bin/egrep", "bin/cpio", "bin/sleep", "bin/mount", "sbin/dhcpcd", "bin/bash", "sbin/insmod", "bin/mkdir", "bin/mknod", "sbin/ip", "bin/cat", "usr/bin/awk", "usr/bin/wget", "bin/cp", "usr/bin/cpio", "usr/bin/zcat", "usr/bin/gzip", "lib/mkinitrd/bin/run-init", "usr/bin/uniq", "usr/bin/sed", "sbin/udevd", "usr/bin/readlink", "usr/bin/expr", "usr/sbin/parted", "sbin/mke2fs", "sbin/mkswap", "sbin/swapon", "bin/chmod", "usr/bin/bc", "usr/bin/xz", "usr/bin/gzip", "usr/bin/tar") {
             getlibs($_);
             push @filestoadd, $_;
         }
diff --git a/xCAT-server/share/xcat/netboot/ubuntu/compute.pkglist b/xCAT-server/share/xcat/netboot/ubuntu/compute.pkglist
index c3839a534..cac5d706a 100644
--- a/xCAT-server/share/xcat/netboot/ubuntu/compute.pkglist
+++ b/xCAT-server/share/xcat/netboot/ubuntu/compute.pkglist
@@ -14,3 +14,4 @@ busybox-static
 gawk
 tar
 gzip
+xz-utils
diff --git a/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu14.04.4.ppc64el.pkglist b/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu14.04.4.ppc64el.pkglist
index 730382c86..1dea61ecb 100644
--- a/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu14.04.4.ppc64el.pkglist
+++ b/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu14.04.4.ppc64el.pkglist
@@ -15,3 +15,4 @@ gawk
 dnsutils
 tar
 gzip
+xz-utils
diff --git a/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu14.04.4.x86_64.pkglist b/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu14.04.4.x86_64.pkglist
index 730382c86..1dea61ecb 100644
--- a/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu14.04.4.x86_64.pkglist
+++ b/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu14.04.4.x86_64.pkglist
@@ -15,3 +15,4 @@ gawk
 dnsutils
 tar
 gzip
+xz-utils
diff --git a/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu14.04.pkglist b/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu14.04.pkglist
index b1357ac5f..6e3b04dc2 100644
--- a/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu14.04.pkglist
+++ b/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu14.04.pkglist
@@ -14,3 +14,4 @@ busybox-static
 gawk
 tar
 gzip
+xz-utils
diff --git a/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu16.04.pkglist b/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu16.04.pkglist
index d3e1da021..77dffd96f 100644
--- a/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu16.04.pkglist
+++ b/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu16.04.pkglist
@@ -14,3 +14,4 @@ busybox-static
 gawk
 tar
 gzip
+xz-utils
diff --git a/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu16.04.ppc64el.pkglist b/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu16.04.ppc64el.pkglist
index 8276befc2..df556b887 100644
--- a/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu16.04.ppc64el.pkglist
+++ b/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu16.04.ppc64el.pkglist
@@ -16,3 +16,4 @@ gawk
 dnsutils
 tar
 gzip
+xz-utils
diff --git a/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu16.04.x86_64.pkglist b/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu16.04.x86_64.pkglist
index 8276befc2..df556b887 100644
--- a/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu16.04.x86_64.pkglist
+++ b/xCAT-server/share/xcat/netboot/ubuntu/compute.ubuntu16.04.x86_64.pkglist
@@ -16,3 +16,4 @@ gawk
 dnsutils
 tar
 gzip
+xz-utils
diff --git a/xCAT-server/share/xcat/netboot/ubuntu/dracut/install.netboot b/xCAT-server/share/xcat/netboot/ubuntu/dracut/install.netboot
index 10f1c7320..372fa4df8 100755
--- a/xCAT-server/share/xcat/netboot/ubuntu/dracut/install.netboot
+++ b/xCAT-server/share/xcat/netboot/ubuntu/dracut/install.netboot
@@ -1,6 +1,6 @@
 #!/bin/sh
 echo $drivers
-dracut_install wget tar cpio gzip dash modprobe touch echo cut wc
+dracut_install wget tar cpio gzip dash modprobe touch echo cut wc xz
 dracut_install grep ifconfig hostname awk egrep grep dirname expr
 dracut_install mount.nfs
 inst "$moddir/xcatroot" "/sbin/xcatroot"
diff --git a/xCAT-server/share/xcat/netboot/ubuntu/dracut/xcatroot b/xCAT-server/share/xcat/netboot/ubuntu/dracut/xcatroot
index 073ec1e4b..67f40c8ed 100755
--- a/xCAT-server/share/xcat/netboot/ubuntu/dracut/xcatroot
+++ b/xCAT-server/share/xcat/netboot/ubuntu/dracut/xcatroot
@@ -39,23 +39,35 @@ if [ -r /rootimg.sfs ]; then
   mkdir -p $NEWROOT/rw
   mount --move /ro $NEWROOT/ro
   mount --move /rw $NEWROOT/rw
-elif [ -r /rootimg.gz ]; then
+elif [ -r /rootimg.cpio.gz ] || [ -r /rootimg.cpio.xz ]; then
   echo Setting up RAM-root tmpfs.
   mount -t tmpfs -o mode=755 rootfs $NEWROOT
   cd $NEWROOT
   echo -n "Extracting root filesystem:"
-  if [ -x /bin/cpio ]; then
-    gzip -cd /rootimg.gz |/bin/cpio -idum
-  else
-    gzip -cd /rootimg.gz |cpio -idum
+  if [ -r /rootimg.cpio.gz ]; then
+    if [ -x /bin/cpio ]; then
+      gzip -cd /rootimg.cpio.gz |/bin/cpio -idum
+    else
+      gzip -cd /rootimg.cpio.gz |cpio -idum
+    fi
+  elif [ -r /rootimg.cpio.xz ]; then
+    if [ -x /bin/cpio ]; then
+      xz -cd /rootimg.cpio.xz |/bin/cpio -idum
+    else
+      xz -cd /rootimg.cpio.xz |cpio -idum
+    fi
   fi
   echo Done
-elif [ -r /rootimg.tgz ]; then
+elif [ -r /rootimg.tar.gz ] || [ -r /rootimg.tar.xz ]; then
   echo Setting up RAM-root tmpfs.
   mount -t tmpfs -o mode=755 rootfs $NEWROOT
   cd $NEWROOT
   echo -n "Extracting root filesystem:"
-  tar --selinux --xattrs-include='*' -zxvf /rootimg.tgz
+  if [ -r /rootimg.tar.gz ]; then
+    tar --selinux --xattrs-include='*' -zxvf /rootimg.tar.gz
+  elif [ -r /rootimg.tar.xz ]; then
+    tar --selinux --xattrs-include='*' -Jxvf /rootimg.tar.xz
+  fi
   echo Done
 elif [ -r /rootimg-statelite.gz ]; then
   echo Setting up RAM-root tmpfs for statelite mode.
diff --git a/xCAT-server/share/xcat/netboot/ubuntu/genimage b/xCAT-server/share/xcat/netboot/ubuntu/genimage
index 870c13b73..8934e44b1 100755
--- a/xCAT-server/share/xcat/netboot/ubuntu/genimage
+++ b/xCAT-server/share/xcat/netboot/ubuntu/genimage
@@ -1441,8 +1441,8 @@ if [ -r /rootimg.sfs ]; then
     mount --move /ro \$NEWROOT/ro
     mount --move /rw \$NEWROOT/rw
 EOMS
-    print $inifile "elif [ -r /rootimg.gz ]; then\n";
-    print $inifile "    ([ \"\$xcatdebugmode\" = \"1\" ] || [ \"\$xcatdebugmode\" = \"2\" ]) && logger -t xcat -p debug \"rootimg.gz downloaded,setting up RAM-root tmpfs...\"\n";
+    print $inifile "elif [ -r /rootimg.cpio.gz ] || [ -r /rootimg.cpio.xz ]; then\n";
+    print $inifile "    ([ \"\$xcatdebugmode\" = \"1\" ] || [ \"\$xcatdebugmode\" = \"2\" ]) && logger -t xcat -p debug \"rootimg downloaded,setting up RAM-root tmpfs...\"\n";
     print $inifile "    echo Setting up RAM-root tmpfs.\n";
     if ($rootlimit) {
         print $inifile "    mount -o \"size=$rootlimit,mode=755\" -t tmpfs rootfs \$NEWROOT\n";
@@ -1452,15 +1452,23 @@ EOMS
     print $inifile "    cd \$NEWROOT\n";
     print $inifile "    ([ \"\$xcatdebugmode\" = \"1\" ] || [ \"\$xcatdebugmode\" = \"2\" ]) && logger -t xcat -p debug \"Extracting root filesystem:\"\n";
     print $inifile "    echo -n \"Extracting root filesystem:\"\n";
-    print $inifile "    if [ -x /bin/cpio ]; then\n";
-    print $inifile "        zcat /rootimg.gz |/bin/cpio -idum\n";
-    print $inifile "    else\n";
-    print $inifile "        zcat /rootimg.gz |cpio -idum\n";
+    print $inifile "    if [ -r /rootimg.cpio.gz ]; then\n";
+    print $inifile "        if [ -x /bin/cpio ]; then\n";
+    print $inifile "            zcat /rootimg.cpio.gz |/bin/cpio -idum\n";
+    print $inifile "        else\n";
+    print $inifile "            zcat /rootimg.cpio.gz |cpio -idum\n";
+    print $inifile "        fi\n";
+    print $inifile "    elif [ -r /rootimg.cpio.xz ]; then\n";
+    print $inifile "        if [ -x /bin/cpio ]; then\n";
+    print $inifile "            xz -cd /rootimg.cpio.xz |/bin/cpio -idum\n";
+    print $inifile "        else\n";
+    print $inifile "            xz -cd /rootimg.cpio.xz |cpio -idum\n";
+    print $inifile "        fi\n";
     print $inifile "    fi\n";
     print $inifile "    ([ \"\$xcatdebugmode\" = \"1\" ] || [ \"\$xcatdebugmode\" = \"2\" ]) && logger -t xcat -p debug \"Done...\"\n";
     print $inifile "    echo Done\n";
-    print $inifile "elif [ -r /rootimg.tgz ]; then\n";
-    print $inifile "    ([ \"\$xcatdebugmode\" = \"1\" ] || [ \"\$xcatdebugmode\" = \"2\" ]) && logger -t xcat -p debug \"rootimg.tgz downloaded,setting up RAM-root tmpfs...\"\n";
+    print $inifile "elif [ -r /rootimg.tar.gz ] || [ -r /rootimg.tar.xz ]; then\n";
+    print $inifile "    ([ \"\$xcatdebugmode\" = \"1\" ] || [ \"\$xcatdebugmode\" = \"2\" ]) && logger -t xcat -p debug \"rootimg downloaded,setting up RAM-root tmpfs...\"\n";
     print $inifile "    echo Setting up RAM-root tmpfs.\n";
 
     if ($rootlimit) {
@@ -1471,7 +1479,11 @@ EOMS
     print $inifile "    cd \$NEWROOT\n";
     print $inifile "    ([ \"\$xcatdebugmode\" = \"1\" ] || [ \"\$xcatdebugmode\" = \"2\" ]) && logger -t xcat -p debug \"Extracting root filesystem:\"\n";
     print $inifile "    echo -n \"Extracting root filesystem:\"\n";
-    print $inifile "    tar --selinux --xattrs-include='*' -zxvf /rootimg.tgz\n";
+    print $inifile "    if [ -r /rootimg.tar.gz ]; then\n";
+    print $inifile "        tar --selinux --xattrs-include='*' -zxvf /rootimg.tar.gz\n";
+    print $inifile "    elif [ -r /rootimg.tar.xz ]; then\n";
+    print $inifile "        tar --selinux --xattrs-include='*' -Jxvf /rootimg.tar.xz\n";
+    print $inifile "    fi\n";
     print $inifile "    ([ \"\$xcatdebugmode\" = \"1\" ] || [ \"\$xcatdebugmode\" = \"2\" ]) && logger -t xcat -p debug \"Done...\"\n";
     print $inifile "    echo Done\n";
     print $inifile "else\n";
@@ -1612,7 +1624,7 @@ EOMS
     }
 
     # add rsync for statelite
-    foreach ("usr/bin/dig", "bin/busybox", "bin/bash", "sbin/mount.nfs", "usr/bin/rsync", "sbin/insmod", "sbin/udevd", "sbin/udevadm", "sbin/modprobe", "sbin/blkid", "sbin/depmod", "usr/bin/wget", "usr/bin/gzip", "usr/bin/tar") {
+    foreach ("usr/bin/dig", "bin/busybox", "bin/bash", "sbin/mount.nfs", "usr/bin/rsync", "sbin/insmod", "sbin/udevd", "sbin/udevadm", "sbin/modprobe", "sbin/blkid", "sbin/depmod", "usr/bin/wget", "usr/bin/xz", "usr/bin/gzip", "usr/bin/tar") {
         getlibs($_);
         push @filestoadd, $_;
     }