Update manual_maintenance.md

manual_maintenance.md

@@ -154,3 +154,15 @@ Now you can edit the `crush_map` file recompile it and inject into the cluster
 ```
 rados list-inconsistent-pg {pool}
 ```
+
+## Slow ops
+```
+ceph daemon mon.cs-001 ops
+```
+Find OSD failures
+```
+ceph daemon mon.cs-001 ops | grep osd_failure
+            "description": "osd_failure(failed timeout osd.130 [v2:131.154.128.179:6876/13353,v1:131.154.128.179:6882/13353] for 24sec e76448 v76448)",
+            "description": "osd_failure(failed timeout osd.166 [v2:131.154.128.199:6937/13430,v1:131.154.128.199:6959/13430] for 24sec e76448 v76448)",
+            "description": "osd_failure(failed timeout osd.175 [v2:131.154.128.199:6924/13274,v1:131.154.128.199:6933/13274] for 24sec e76448 v76448)",
+```