diff --git a/docs/source/guides/admin-guides/manage_clusters/common/deployment/enable_kdump.rst b/docs/source/guides/admin-guides/manage_clusters/common/deployment/enable_kdump.rst
index d3cc84a67..17b8ea5cb 100644
--- a/docs/source/guides/admin-guides/manage_clusters/common/deployment/enable_kdump.rst
+++ b/docs/source/guides/admin-guides/manage_clusters/common/deployment/enable_kdump.rst
@@ -57,11 +57,11 @@ The kdump will create a new initrd which used in the dumping stage. The ``/tmp``
 
 * **[RHELS]** ::
 
-    tmpfs   /var/tmp    tmpfs   defaults,size=200m   0 2
+    tmpfs   /var/tmp    tmpfs   defaults,size=500m   0 2
 
 * **[SLES11]** ::
 
-    tmpfs   /tmp    tmpfs   defaults,size=200m       0 2
+    tmpfs   /tmp    tmpfs   defaults,size=500m       0 2
 
 * **[Ubuntu]** ::
 
diff --git a/xCAT/postscripts/enablekdump b/xCAT/postscripts/enablekdump
index 3a61bcfc0..92fd65881 100755
--- a/xCAT/postscripts/enablekdump
+++ b/xCAT/postscripts/enablekdump
@@ -246,10 +246,8 @@ EOF
 
                echo "nfs $KDIP:$KDPATH" > /etc/kdump.conf
                echo "default shell" >> /etc/kdump.conf
-               if (pmatch $OSVER "rhel7*") || (pmatch $OSVER "rhels7*");then
-                   #strip "xcat" out of the initramfs for kdump
-                   echo "dracut_args --omit \"xcat\"" >> /etc/kdump.conf
-               fi
+               #strip "xcat" out of the initramfs for kdump
+               echo "dracut_args --omit \"xcat\"" >> /etc/kdump.conf
                #strip the unnecessary kernel options from /proc/cmdline
                #the modified "cmdline" will be used as the kernel options
                #for kdump initramfs; otherwise, the "service kdump restart" will fail
@@ -262,7 +260,9 @@ EOF
                        fi
                done
                sed -i "s#^[\t ]*KDUMP_COMMANDLINE=\"#KDUMP_COMMANDLINE=\"$kdumpcmdline#" /etc/sysconfig/kdump
-               sed -i "s#^[\t ]*KDUMP_COMMANDLINE_APPEND=\"#KDUMP_COMMANDLINE_APPEND=\"root=nfs:$KDIP:$KDPATH #" /etc/sysconfig/kdump
+               if (pmatch $OSVER "rhel7*") || (pmatch $OSVER "rhels7*"); then
+                   sed -i "s#^[\t ]*KDUMP_COMMANDLINE_APPEND=\"#KDUMP_COMMANDLINE_APPEND=\"root=nfs:$KDIP:$KDPATH #" /etc/sysconfig/kdump
+               fi
                [ -f /etc/dracut.conf ] && mv /etc/dracut.conf  /tmp/dracut.conf
                restartservice kdump
                [ -f /tmp/dracut.conf ] && mv /tmp/dracut.conf /etc/dracut.conf