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 e96f78bc3..56d8b37b4 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat
@@ -32,7 +32,7 @@ cmd:a=0;while true; do [ $a -eq 100 ] && exit 1;output=$(makedhcp -q $$CN);[ $?
 check:rc==0
 cmd:copycds $$ISO 
 check:rc==0
-cmd:if [[ "__GETNODEATTR($$CN,os)__" =~ "sles11" ]] || [[ "__GETNODEATTR($$CN,os)__" =~ "rhels" ]];then chdef -t node -o $$CN postscripts=setupntp; fi
+cmd:if [[ "__GETNODEATTR($$CN,os)__" =~ "sles11" ]] || [[ "__GETNODEATTR($$CN,os)__" =~ "rhels" ]] || [[ "__GETNODEATTR($$CN,os)__" =~ "sles12.2" ]];then chdef -t node -o $$CN postscripts=setupntp; fi
 cmd:lsdef -l $$CN
 check:rc==0
 cmd:rinstall $$CN osimage=__GETNODEATTR($$CN,os)__-__GETNODEATTR($$CN,arch)__-install-compute
@@ -55,10 +55,10 @@ cmd:xdsh $$CN mount
 check:rc==0
 cmd:sleep 120
 #comment for further discussion
-#cmd:if [[ "__GETNODEATTR($$CN,os)__" =~ "sles11" ]] || [[ "__GETNODEATTR($$CN,os)__" =~ "rhels" ]];then xdsh $$CN service ntpd status;fi
+#cmd:if [[ "__GETNODEATTR($$CN,os)__" =~ "sles11" ]] || [[ "__GETNODEATTR($$CN,os)__" =~ "rhels" ]] || [[ "__GETNODEATTR($$CN,os)__" =~ "sles12.2" ]];then xdsh $$CN service ntpd status;fi
 #check:rc==0
 #check:output=~running
-cmd:if [[ "__GETNODEATTR($$CN,os)__" =~ "sles11" ]] || [[ "__GETNODEATTR($$CN,os)__" =~ "rhels" ]];then chdef -t node -o $$CN postscripts=" "; fi
+cmd:if [[ "__GETNODEATTR($$CN,os)__" =~ "sles11" ]] || [[ "__GETNODEATTR($$CN,os)__" =~ "rhels" ]] || [[ "__GETNODEATTR($$CN,os)__" =~ "sles12.2" ]];then chdef -t node -o $$CN postscripts=" "; fi
 cmd:lsdef -l $$CN
 check:rc==0
 cmd:ping $$CN -c 3