diff --git a/xCAT-test/autotest/testcase/installation/aix_diskless_installation b/xCAT-test/autotest/testcase/installation/aix_diskless_installation
index 8e784a81c..eb0c77736 100644
--- a/xCAT-test/autotest/testcase/installation/aix_diskless_installation
+++ b/xCAT-test/autotest/testcase/installation/aix_diskless_installation
@@ -26,6 +26,7 @@ cmd:makeconservercf
 check:rc==0
 cmd:cat /etc/conserver.cf | grep $$CN
 check:output=~$$CN
+cmd:sleep 60
 cmd:getmacs $$CN -f -D
 check:rc==0
 cmd:mkdsklsnode -i autotestcosi $$CN
diff --git a/xCAT-test/autotest/testcase/installation/linux_diskless_installation b/xCAT-test/autotest/testcase/installation/linux_diskless_installation
index e522e4937..17eb38317 100644
--- a/xCAT-test/autotest/testcase/installation/linux_diskless_installation
+++ b/xCAT-test/autotest/testcase/installation/linux_diskless_installation
@@ -13,6 +13,7 @@ cmd:makeconservercf
 check:rc==0
 cmd:cat /etc/conserver.cf | grep $$CN
 check:output=~$$CN
+cmd:sleep 60
 cmd:getmacs $$CN -f -D
 check:rc==0
 cmd:makedhcp -n
diff --git a/xCAT-test/autotest/testcase/installation/linux_full_installation b/xCAT-test/autotest/testcase/installation/linux_full_installation
index 09d17874a..6450efeed 100644
--- a/xCAT-test/autotest/testcase/installation/linux_full_installation
+++ b/xCAT-test/autotest/testcase/installation/linux_full_installation
@@ -13,6 +13,7 @@ cmd:makeconservercf
 check:rc==0
 cmd:cat /etc/conserver.cf | grep $$CN
 check:output=~$$CN
+cmd:sleep 60
 cmd:getmacs $$CN -f -D
 check:rc==0
 cmd:makedhcp -n