diff --git a/xCAT-test/autotest/testcase/installation/Diskless_installation_flat_p8_le b/xCAT-test/autotest/testcase/installation/Diskless_installation_flat_p8_le
index 7e9dda6d1..6b1370248 100644
--- a/xCAT-test/autotest/testcase/installation/Diskless_installation_flat_p8_le
+++ b/xCAT-test/autotest/testcase/installation/Diskless_installation_flat_p8_le
@@ -3,7 +3,7 @@ os:Linux
 
 cmd:copycds $$ISO
 check:rc==0
-cmd:if [ "__GETNODEATTR($$CN,arch)__" != "ppc64"  -a  "__GETNODEATTR($$CN,mgt)__" != "ipmi" ];then rmvm $$CN -f -p  &&  mkvm $$CN -s 20G; fi
+cmd:if [ "__GETNODEATTR($$CN,arch)__" != "ppc64"  -a  "__GETNODEATTR($$CN,mgt)__" != "ipmi" ];then if [[ "__GETNODEATTR($$CN,vmstorage)__" =~ "phy" ]]; then rmvm $$CN -f -p  &&  mkvm $$CN; else rmvm $$CN -f -p  &&  mkvm $$CN -s 20G; fi;fi
 check:rc==0
 cmd:makedns -n
 check:rc==0
diff --git a/xCAT-test/autotest/testcase/installation/SN_setup_case b/xCAT-test/autotest/testcase/installation/SN_setup_case
index c345f776f..d791de94b 100644
--- a/xCAT-test/autotest/testcase/installation/SN_setup_case
+++ b/xCAT-test/autotest/testcase/installation/SN_setup_case
@@ -7,7 +7,7 @@ check:rc==0
 
 cmd:chtab key=nameservers site.value="<xcatmaster>"
 check:rc==0
-cmd:if [[ "__GETNODEATTR($$SN,arch)__" =~ "x86_64" ]];then chdef -t node -o $$SN vmstorage=dir:///var/lib/libvirt/images/ && rmvm $$SN -f -p &&  mkvm $$SN -s 25G; fi
+cmd:if [ "__GETNODEATTR($$SN,arch)__" != "ppc64"  -a  "__GETNODEATTR($$SN,mgt)__" != "ipmi" ];then if [[ "__GETNODEATTR($$SN,vmstorage)__" =~ "phy" ]]; then rmvm $$SN -f -p  &&  mkvm $$SN; else rmvm $$SN -f -p  &&  mkvm $$SN -s 20G; fi;fi
 
 cmd:makedns -n
 check:rc==0
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 e10b502a7..5a938f67b 100644
--- a/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat
+++ b/xCAT-test/autotest/testcase/installation/reg_linux_diskfull_installation_flat
@@ -5,7 +5,8 @@ cmd:if ping -c 1 $$SN > /dev/null;then rpower $$SN off > /dev/null;fi
 
 cmd:chdef -t node -o $$CN servicenode= monserver=$$MN nfsserver=$$MN tftpserver=$$MN  xcatmaster=$$MN
 check:rc==0
-cmd:if [ "__GETNODEATTR($$CN,arch)__" != "ppc64"  -a  "__GETNODEATTR($$CN,mgt)__" != "ipmi" ];then rmvm $$CN -f -p  &&  mkvm $$CN -s 20G; fi
+cmd:if [ "__GETNODEATTR($$CN,arch)__" != "ppc64"  -a  "__GETNODEATTR($$CN,mgt)__" != "ipmi" ];then if [[ "__GETNODEATTR($$CN,vmstorage)__" =~ "phy" ]]; then rmvm $$CN -f -p  &&  mkvm $$CN; else rmvm $$CN -f -p  &&  mkvm $$CN -s 20G; fi;fi
+check:rc=0
 cmd:makedns -n
 check:rc==0
 cmd:makeconservercf 
diff --git a/xCAT-test/autotest/testcase/installation/ubuntu_diskless_installation_vm b/xCAT-test/autotest/testcase/installation/ubuntu_diskless_installation_vm
index a3d4d8850..7ae29b85a 100644
--- a/xCAT-test/autotest/testcase/installation/ubuntu_diskless_installation_vm
+++ b/xCAT-test/autotest/testcase/installation/ubuntu_diskless_installation_vm
@@ -3,7 +3,8 @@ os:Linux
 
 cmd:copycds $$ISO
 check:rc==0
-cmd:if [ "__GETNODEATTR($$CN,arch)__" = "x86_64" ]; then rmvm $$CN -f -p && mkvm $$CN -s 20G; fi
+cmd:if [ "__GETNODEATTR($$CN,arch)__" != "ppc64"  -a  "__GETNODEATTR($$CN,mgt)__" != "ipmi" ];then if [[ "__GETNODEATTR($$CN,vmstorage)__" =~ "phy" ]]; then rmvm $$CN -f -p  &&  mkvm $$CN; else rmvm $$CN -f -p  &&  mkvm $$CN -s 20G; fi;fi
+check:rc=0
 cmd:makedns -n
 check:rc==0
 cmd:makedhcp -n