--- lib/filters/device-types.h.orig	2012-08-07 14:05:15.000000000 -0700
+++ lib/filters/device-types.h.orig	2013-02-21 06:48:26.684979000 -0800
@@ -56,5 +56,6 @@ 
 	{"blkext", 1},		/* Extended device partitions */
 	{"fio", 16},		/* Fusion */
 	{"mtip32xx", 16},	/* Micron PCIe SSDs */
+	{"zvol", 16},		/* ZFS Zvols */
 	{"", 0}
 };