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 b82f23b92..267944daf 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:output=~__GETNODEATTR($$CN,os)__-__GETNODEATTR($$CN,arch)__-netboot-comput
 cmd:if [[ "__GETNODEATTR($$CN,arch)__" =~ "ppc64" ]]; then rnetboot $$CN;elif [[ "__GETNODEATTR($$CN,arch)__" =~ "x86_64" ]];then rpower $$CN boot; fi
 check:rc==0
 
-cmd:sleep 300
+cmd:sleep 900
 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 $$CN -c 3
diff --git a/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_hierarchy b/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_hierarchy
index b124057af..9119eee1a 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_hierarchy
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_diskless_installation_hierarchy
@@ -50,7 +50,7 @@ check:output=~__GETNODEATTR($$CN,os)__-__GETNODEATTR($$CN,arch)__-netboot-comput
 cmd:if [[ "__GETNODEATTR($$CN,arch)__" =~ "ppc64" ]]; then rnetboot $$CN;elif [[ "__GETNODEATTR($$CN,arch)__" =~ "x86_64" ]];then rpower $$CN boot; fi
 check:rc==0
 
-cmd:sleep 300
+cmd:sleep 900
 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 $$CN -c 3
diff --git a/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_flat b/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_flat
index 8aa74ba8a..f02dab8f5 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_flat
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_flat
@@ -65,7 +65,7 @@ check:output=~statelite
 cmd:if [[ "__GETNODEATTR($$CN,arch)__" =~ "ppc64" ]]; then rnetboot $$CN;elif [[ "__GETNODEATTR($$CN,arch)__" =~ "x86_64" ]];then rpower $$CN boot; fi
 check:rc==0
 
-cmd:sleep 300
+cmd:sleep 900
 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 $$CN -c 3
@@ -100,7 +100,7 @@ check:output=~__GETNODEATTR($$CN,os)__-__GETNODEATTR($$CN,arch)__-statelite-comp
 cmd:if [[ "__GETNODEATTR($$CN,arch)__" =~ "ppc64" ]]; then rnetboot $$CN;elif [[ "__GETNODEATTR($$CN,arch)__" =~ "x86_64" ]];then rpower $$CN boot; fi
 check:rc==0
 
-cmd:sleep 300
+cmd:sleep 900
 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 $$CN -c 3
diff --git a/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_hierarchy b/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_hierarchy
index ddbd24ebc..0f85312c9 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_hierarchy
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_statelite_installation_hierarchy
@@ -77,7 +77,7 @@ check:output=~statelite
 cmd:if [[ "__GETNODEATTR($$CN,arch)__" =~ "ppc64" ]]; then rnetboot $$CN;elif [[ "__GETNODEATTR($$CN,arch)__" =~ "x86_64" ]];then rpower $$CN boot; fi
 check:rc==0
 
-cmd:sleep 300
+cmd:sleep 900
 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 $$CN -c 3
@@ -115,7 +115,7 @@ check:output=~__GETNODEATTR($$CN,os)__-__GETNODEATTR($$CN,arch)__-statelite-comp
 cmd:if [[ "__GETNODEATTR($$CN,arch)__" =~ "ppc64" ]]; then rnetboot $$CN;elif [[ "__GETNODEATTR($$CN,arch)__" =~ "x86_64" ]];then rpower $$CN boot; fi
 check:rc==0
 
-cmd:sleep 300
+cmd:sleep 900
 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