diff --git a/HowtoCeph.md b/HowtoCeph.md
index 7475aefe..b8afca94 100644
--- a/HowtoCeph.md
+++ b/HowtoCeph.md
@@ -895,4 +895,22 @@ Watchers:
         watcher=x.y.z.t:0/2718281828 client.2718281 cookie=271828182845904
 ```
 
-L’IP du client est `x.y.z.t`.
\ No newline at end of file
+L’IP du client est `x.y.z.t`.
+
+## `daemons [osd.N,mon.hostname] have slow ops`
+
+Si la commande `ceph -s` retourne l’erreur suivante :
+
+```
+  cluster:
+    id:     01234567-89ab-cdef-0123-456789abcdef
+    health: HEALTH_WARN
+            NN slow ops, oldest one blocked for 1000000 sec, daemons [osd.N,mon.hostname] have slow ops.
+```
+
+On peut essayer de redémarrer le service `ceph-mon` sur le serveur `hostname` :
+
+```bash
+systemctl stop ceph-mon@hostname.service
+systemctl start ceph-mon@hostname.service
+```
\ No newline at end of file