diff --git a/group_vars/metricspi/alerts.yml b/group_vars/metricspi/alerts.yml
index cb59042..03b253c 100644
--- a/group_vars/metricspi/alerts.yml
+++ b/group_vars/metricspi/alerts.yml
@@ -46,3 +46,23 @@ vmalert_rules:
       expr: collectd_md_md_disks{type="missing", instance!~"burp.*"} != 0
     - alert: mdraid failed disk
       expr: collectd_md_md_disks{type="failed"} != 0
+
+  - name: BURP RAID
+    rules:
+    - alert: disks need swapped
+      expr:
+        time() - tlast_change_over_time(
+          (
+            collectd_md_md_disks{instance="burp1.pyrocufflink.blue", type="active"}
+            or last_over_time(collectd_md_md_disks{instance="burp1.pyrocufflink.blue", type="active"})[1d]
+          )[1d]
+        ) > 86400 * 30
+      annotations:
+        summary: The disks in the BURP array need swapped
+        description: >-
+          The disks in the BURP RAID-1 (mirror) array should be swapped
+          periodically. One disk should be online and mounted while the other
+          is stored in the fireproof safe.  Switching them ensures that even if
+          something happens to the active disk, such as hardware failure, power
+          surge, fire, or accidental `rm -rf`, the offline disk is only out of
+          date by a few weeks.