diff --git a/xCAT-server-2.0/lib/xcat/plugins/blade.pm b/xCAT-server-2.0/lib/xcat/plugins/blade.pm
index b7a4189f9..a9773f9ed 100644
--- a/xCAT-server-2.0/lib/xcat/plugins/blade.pm
+++ b/xCAT-server-2.0/lib/xcat/plugins/blade.pm
@@ -912,6 +912,9 @@ sub inv {
     push @invitems,split( /,/,$_);
   }
   my $item;
+  unless (scalar(@invitems)) {
+      @invitems = ("all");
+  }
   while (my $item = shift @invitems) {
     if ($item =~ /^all/) {
       push @invitems,(qw(mtm serial mac firm));
diff --git a/xCAT-server-2.0/lib/xcat/plugins/ipmi.pm b/xCAT-server-2.0/lib/xcat/plugins/ipmi.pm
index 249938eda..aed500ec5 100644
--- a/xCAT-server-2.0/lib/xcat/plugins/ipmi.pm
+++ b/xCAT-server-2.0/lib/xcat/plugins/ipmi.pm
@@ -1454,6 +1454,9 @@ sub inv {
 		return($rc,$text);
 	}
 
+    unless ($subcommand) {
+        $subcommand = "all";
+    }
 	if($subcommand eq "all") {
 		@types = qw(model serial deviceid mprom guid);
 	}
@@ -1479,7 +1482,7 @@ sub inv {
 		@types = qw(guid);
 	}
 	else {
-		return(1,"unsupported command inv $subcommand");
+		return(1,"unsupported BMC inv argument $subcommand");
 	}
 
 	foreach(@types) {