diff --git a/roles/prometheus/templates/prometheus/alert.rules.yml.j2 b/roles/prometheus/templates/prometheus/alert.rules.yml.j2
index 1a58fd38..ce7f711b 100644
--- a/roles/prometheus/templates/prometheus/alert.rules.yml.j2
+++ b/roles/prometheus/templates/prometheus/alert.rules.yml.j2
@@ -51,6 +51,15 @@ groups:
     annotations:
       summary: "CPU sur {{ $labels.instance }} à {{ $value }}%."
 
+  # Check mdadm software RAID
+  - alert: SoftwareRAIDDegraded
+    expr: node_md_disks-node_md_disks_active > 0
+    for: 3m
+    labels:
+      severity: warning
+    annotations:
+      summary: "Le RAID sur {{ $labels.instance }} a perdu {{ $value }} disque(s)."
+
   # Check systemd unit (> buster)
   - alert: SystemdServiceFailed
     expr: node_systemd_unit_state{state="failed"} == 1