--- dumpon.orig	2013-10-27 16:15:05.000000000 -0500
+++ dumpon	2013-11-06 07:44:38.137819839 -0600
@@ -47,6 +47,13 @@
 		echo "No suitable dump device was found." 1>&2
 		return 1
 		;;
+	/dev/mirror/*)
+		mirror_balance=`gmirror list ${dumpdev#/dev/mirror/} | grep ^Balance:`
+		mirror_balance=${mirror_balance#Balance: }
+		gmirror configure -b prefer ${dumpdev#/dev/mirror/}
+		dumpon_try "${dumpdev}"
+		gmirror configure -b ${mirror_balance} ${dumpdev#/dev/mirror/}
+		;;
 	*)
 		dumpon_try "${dumpdev}"
 		;;