diff --git a/xCAT-server/lib/xcat/plugins/aixinstall.pm b/xCAT-server/lib/xcat/plugins/aixinstall.pm
index 9f5580c79..de5ea698d 100644
--- a/xCAT-server/lib/xcat/plugins/aixinstall.pm
+++ b/xCAT-server/lib/xcat/plugins/aixinstall.pm
@@ -5158,7 +5158,7 @@ sub chkFSspace
     {
 
         $space_needed = int($size - $free_space);
-        my $addsize  = $space_needed + 10;
+        my $addsize  = $space_needed + 100;
         my $sizeattr = "-a size=+$addsize" . "M";
         my $chcmd    = "/usr/sbin/chfs $sizeattr $FSname";