Index: libexec/rc/rc.d/zvol
===================================================================
--- libexec/rc/rc.d/zvol
+++ libexec/rc/rc.d/zvol
@@ -17,8 +17,20 @@
 stop_cmd="zvol_stop"
 required_modules="zfs"
 
+zvol_import()
+{
+	local cachefile
+
+	for cachefile in /boot/zfs/zpool.cache /etc/zfs/zpool.cache; do
+		if [ -r $cachefile ]; then
+			zpool import -c $cachefile -a -N
+		fi
+	done
+}
+
 zvol_start()
 {
+	zvol_import
 	# Enable swap on ZVOLs with property org.freebsd:swap=on.
 	zfs list -H -o org.freebsd:swap,name -t volume |
 	while read state name; do