diff --git a/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_flat b/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_flat
index f2019566a..6fde471d5 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_flat
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_flat
@@ -47,7 +47,7 @@ check:rc==0
 check:output=~Provision node\(s\)\: $$CN
 
 cmd:if [[ -f /var/lib/dhcp/db/dhcpd.leases ]]; then cat /var/lib/dhcp/db/dhcpd.leases; elif [[ -f /var/lib/dhcpd/dhcpd.leases ]];then cat /var/lib/dhcpd/dhcpd.leases;elif [[ -f /var/lib/dhcp/dhcpd.leases ]];then cat /var/lib/dhcp/dhcpd.leases; fi
-cmd:sleep 900
+cmd:sleep 300
 cmd:a=0;while ! `lsdef -l $$CN|grep status|grep booted >/dev/null`; do sleep 10;((a++));if [ $a -gt 60 ];then break;fi done
 
 cmd:ping $$CN -c 3
diff --git a/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_flat_postscripts_failed b/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_flat_postscripts_failed
index 3a1d12b57..37f3d0d0f 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_flat_postscripts_failed
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_flat_postscripts_failed
@@ -50,7 +50,7 @@ cmd:rinstall $$CN osimage=__GETNODEATTR($$CN,os)__-__GETNODEATTR($$CN,arch)__-ne
 check:rc==0
 check:output=~Provision node\(s\)\: $$CN
 
-cmd:sleep 900
+cmd:sleep 300
 cmd:a=0;while ! `lsdef -l $$CN|grep status|grep failed >/dev/null`; do sleep 10;((a++));if [ $a -gt 60 ];then break;fi done
 
 cmd:ping $$CN -c 3
diff --git a/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_hierarchy b/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_hierarchy
index 920c1d563..d846fca5a 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_hierarchy
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_hierarchy
@@ -53,7 +53,7 @@ check:rc==0
 check:output=~Provision node\(s\)\: $$CN
 
 cmd:xdsh $$SN "if [[ -f /var/lib/dhcp/db/dhcpd.leases ]]; then cat /var/lib/dhcp/db/dhcpd.leases; elif [[ -f /var/lib/dhcpd/dhcpd.leases ]];then cat /var/lib/dhcpd/dhcpd.leases;elif [[ -f /var/lib/dhcp/dhcpd.leases ]];then cat /var/lib/dhcp/dhcpd.leases; fi"
-cmd:sleep 900
+cmd:sleep 300
 cmd:a=0;while ! `lsdef -l $$CN|grep status|grep booted >/dev/null`; do sleep 10;((a++));if [ $a -gt 60 ];then break;fi done
 
 cmd:ping $$CN -c 3
diff --git a/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_flat b/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_flat
index 7cc906537..de1331b54 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_flat
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_flat
@@ -59,7 +59,7 @@ check:rc==0
 check:output=~Provision node\(s\)\: $$CN
 
 cmd:if [[ -f /var/lib/dhcp/db/dhcpd.leases ]]; then cat /var/lib/dhcp/db/dhcpd.leases; elif [[ -f /var/lib/dhcpd/dhcpd.leases ]];then cat /var/lib/dhcpd/dhcpd.leases;elif [[ -f /var/lib/dhcp/dhcpd.leases ]];then cat /var/lib/dhcp/dhcpd.leases; fi
-cmd:sleep 900
+cmd:sleep 300
 cmd:a=0;while ! `lsdef -l $$CN|grep status|grep booted >/dev/null`; do sleep 10;((a++));if [ $a -gt 60 ];then break;fi done
 
 cmd:ping $$CN -c 3
@@ -97,7 +97,7 @@ check:rc==0
 check:output=~Provision node\(s\)\: $$CN
 
 cmd:if [[ -f /var/lib/dhcp/db/dhcpd.leases ]]; then cat /var/lib/dhcp/db/dhcpd.leases; elif [[ -f /var/lib/dhcpd/dhcpd.leases ]];then cat /var/lib/dhcpd/dhcpd.leases;elif [[ -f /var/lib/dhcp/dhcpd.leases ]];then cat /var/lib/dhcp/dhcpd.leases; fi
-cmd:sleep 900
+cmd:sleep 300
 cmd:a=0;while ! `lsdef -l $$CN|grep status|grep booted >/dev/null`; do sleep 10;((a++));if [ $a -gt 60 ];then break;fi done
 
 cmd:ping $$CN -c 3
diff --git a/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_hierarchy_by_nfs b/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_hierarchy_by_nfs
index 65ac3cf86..802491f64 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_hierarchy_by_nfs
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_hierarchy_by_nfs
@@ -79,7 +79,7 @@ check:rc==0
 check:output=~Provision node\(s\)\: $$CN
 
 cmd:xdsh $$SN "if [[ -f /var/lib/dhcp/db/dhcpd.leases ]]; then cat /var/lib/dhcp/db/dhcpd.leases; elif [[ -f /var/lib/dhcpd/dhcpd.leases ]];then cat /var/lib/dhcpd/dhcpd.leases;elif [[ -f /var/lib/dhcp/dhcpd.leases ]];then cat /var/lib/dhcp/dhcpd.leases; fi"
-cmd:sleep 900
+cmd:sleep 300
 cmd:a=0;while ! `lsdef -l $$CN|grep status|grep booted >/dev/null`; do sleep 10;((a++));if [ $a -gt 60 ];then break;fi done
 
 cmd:ping $$CN -c 3
diff --git a/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_hierarchy_by_ramdisk b/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_hierarchy_by_ramdisk
index fd7d84f4e..c61e15ac2 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_hierarchy_by_ramdisk
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_hierarchy_by_ramdisk
@@ -73,7 +73,7 @@ check:rc==0
 check:output=~Provision node\(s\)\: $$CN
 
 cmd:xdsh $$SN "if [[ -f /var/lib/dhcp/db/dhcpd.leases ]]; then cat /var/lib/dhcp/db/dhcpd.leases; elif [[ -f /var/lib/dhcpd/dhcpd.leases ]];then cat /var/lib/dhcpd/dhcpd.leases;elif [[ -f /var/lib/dhcp/dhcpd.leases ]];then cat /var/lib/dhcp/dhcpd.leases; fi"
-cmd:sleep 900
+cmd:sleep 300
 cmd:a=0;while ! `lsdef -l $$CN|grep status|grep booted >/dev/null`; do sleep 10;((a++));if [ $a -gt 60 ];then break;fi done
 
 cmd:ping $$CN -c 3
diff --git a/xCAT-test/autotest/testcase/kdump/linux_diskless_kdump b/xCAT-test/autotest/testcase/kdump/linux_diskless_kdump
index 5437d5f32..8e64f5479 100644
--- a/xCAT-test/autotest/testcase/kdump/linux_diskless_kdump
+++ b/xCAT-test/autotest/testcase/kdump/linux_diskless_kdump
@@ -35,7 +35,8 @@ check:rc==0
 
 cmd:if [ ! -d /kdumpdir ]; then mkdir -p /kdumpdir && chmod 777 /kdumpdir; fi
 cmd:if [ ! -f /etc/exports ] ;then touch /etc/exports;else cp /etc/exports /etc/exports.bak;fi
-cmd:echo -e "/kdumpdir *(rw,no_root_squash,sync,no_subtree_check)" >> /etc/exports && exportfs /etc/exports  fi;
+cmd:cat /etc/exports|grep kdumpdir; if [ "$?" -ne "0" ]; then echo "/kdumpdir *(rw,no_root_squash,sync,no_subtree_check)" >> /etc/exports; fi
+cmd:cd /etc; export exports;cd -;service nfs restart
 cmd:chdef -t osimage __GETNODEATTR($$CN,os)__-__GETNODEATTR($$CN,arch)__-netboot-compute dump=nfs://$$MN/kdumpdir
 check:rc==0
 
@@ -55,7 +56,7 @@ cmd:rinstall $$CN osimage=__GETNODEATTR($$CN,os)__-__GETNODEATTR($$CN,arch)__-ne
 check:rc==0
 check:output=~Provision node\(s\)\: $$CN
 
-cmd:sleep 900
+cmd:sleep 300
 cmd:a=0;while ! `lsdef -l $$CN|grep status|grep booted >/dev/null`; do sleep 10;((a++));if [ $a -gt 60 ];then break;fi done
 
 cmd:ping $$CN -c 3