diff --git a/src/ior.c b/src/ior.c
index f4dbe41..59b7802 100755
--- a/src/ior.c
+++ b/src/ior.c
@@ -2701,7 +2701,6 @@ static IOR_offset_t WriteOrRead(IOR_param_t * test, IOR_results_t * results, voi
                 offsetArray = GetOffsetArraySequential(test, pretendRank);
         }
 
-
         /* check for stonewall */
         startForStonewall = GetTimeStamp();
         hitStonewall = ((test->deadlineForStonewalling != 0)
diff --git a/src/mdtest.c b/src/mdtest.c
index defd6b6..838a586 100644
--- a/src/mdtest.c
+++ b/src/mdtest.c
@@ -1646,6 +1646,10 @@ void valid_tests() {
         FAIL("-c not compatible with -B");
     }
 
+    if ( strcasecmp(backend_name, "POSIX") != 0) {
+      FAIL("-a only supported interface is POSIX right now!");
+    }
+
     /* check for shared file incompatibilities */
     if (unique_dir_per_task && shared_file && rank == 0) {
         FAIL("-u not compatible with -S");
diff --git a/testing/basic-tests.sh b/testing/basic-tests.sh
index e53c091..01d7477 100755
--- a/testing/basic-tests.sh
+++ b/testing/basic-tests.sh
@@ -11,6 +11,7 @@ ROOT=${0%/*}
 source $ROOT/test-lib.sh
 
 MDTEST 1 -a POSIX
+#MDTEST 2 -a POSIX -W 2
 
 IOR 1 -a POSIX -w    -z                  -F -Y -e -i1 -m -t 100k -b 1000k
 IOR 1 -a POSIX -w    -z                  -F -k -e -i2 -m -t 100k -b 100k