Index: head/etc/periodic/daily/800.scrub-zfs
===================================================================
--- head/etc/periodic/daily/800.scrub-zfs
+++ head/etc/periodic/daily/800.scrub-zfs
@@ -43,6 +43,10 @@
 			rc=3
 			echo "Skipping faulted pool: ${pool}"
 			continue ;;
+		*UNAVAIL*)
+			rc=4
+			echo "Skipping unavailable pool: ${pool}"
+			continue ;;
 		esac
 
 		# determine how many days shall be between scrubs