diff -upr ndctl-56.vanilla/ndctl/builtin-xaction-namespace.c ndctl-56/ndctl/builtin-xaction-namespace.c
--- ndctl-56.vanilla/ndctl/builtin-xaction-namespace.c	2017-03-26 16:15:54.957274589 -0400
+++ ndctl-56/ndctl/builtin-xaction-namespace.c	2017-03-26 16:16:32.671793238 -0400
@@ -213,7 +213,7 @@ static int set_defaults(enum namespace_a
 				param.align);
 		rc = -EINVAL;
 	} else if (!param.align) {
-		param.align = "2M";
+		param.align = "4K";
 		param.align_default = true;
 	}
 
Only in ndctl-56/ndctl: builtin-xaction-namespace.c.orig