diff --git a/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat b/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat
index 5ee4a9d22..242c77ea3 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat
@@ -35,11 +35,8 @@ check:rc==0
 cmd:if [ "__GETNODEATTR($$CN,mgt)__" != "ipmi" ];then if [ "__GETNODEATTR($$CN,arch)__" = "ppc64" ];then rnetboot $$CN;else rpower $$CN boot;fi else rpower $$CN boot;fi
 check:rc==0
 
-cmd:if [[ "__GETNODEATTR($$CN,mgt)__" =~ "ipmi" ]]; then sleep 1800;elif [[ "__GETNODEATTR($$CN,arch)__" =~ "ppc64" ]];then sleep 1200;else sleep 600;fi
-
-cmd:lsdef -l $$CN | grep status
-
-cmd:a=0;while ! `lsdef -l $$CN|grep status|grep booted >/dev/null`; do sleep 10;((a++));if [ $a -gt 300 ];then break;fi done
+cmd:sleep 300
+cmd:a=0;while ! `lsdef -l $$CN|grep status|grep booted >/dev/null`; do sleep 20;((a++));if [ $a -gt 300 ];then break;fi done
 
 cmd:ping $$CN -c 3
 check:rc==0