Index: sys/geom/vinum/geom_vinum.c
===================================================================
--- sys/geom/vinum/geom_vinum.c	(revision 195745)
+++ sys/geom/vinum/geom_vinum.c	(working copy)
@@ -133,10 +133,12 @@
 	error = ENXIO;
 	gp = pp->geom;
 	sc = gp->softc;
-	if (dw > 0 && dr == 0)
-		dr = 1;
-	else if (dw < 0 && dr == 0)
-		dr = -1;
+	/*
+	 * We want to modify the read count with the write count in case we have
+	 * plexes in a RAID-5 organization.
+	 */
+	dr += dw;
+
 	LIST_FOREACH(d, &sc->drives, drive) {
 		if (d->consumer == NULL)
 			continue;