Fix off-by-one size error in iSCSI device setup.

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@893 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-server-2.0/lib/xcat/plugins/iscsi.pm

@@ -109,6 +109,7 @@ sub process_request {
          $rsp{data}=["Creating $fileloc ($lunsize MB)"];
          $callback->({node=>[\%rsp]});
          %rsp=(name=>[$node]);
+         $lunsize -= 1;
          my $rc = system("dd if=/dev/zero of=$fileloc bs=1M count=1 seek=$lunsize");
          if ($rc) {
             $rsp{error}=["dd process exited with return code $rc"];