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--- progetti:cloud-areapd:ceph:slow_requests_debugging [2019/02/05 13:33] – sgaravat@infn.it
+++ progetti:cloud-areapd:ceph:slow_requests_debugging [2019/02/05 13:34] (current) – sgaravat@infn.it
@@ Line 1: / Line 1: @@
+======= slow requests debugging =======
+<code bash>
+ceph health detail
+</code>
+da` gli OSD problematici.
+Per debuggare gli OSD problematici:
+<code bash>
+ceph daemon osd.<id> ops
+</code>
+da` la coda delle operazioni
+------------------------------
+<code bash>
+ceph daemon osd.3 dump_blocked_ops
+</code>
+mostra le operazioni bloccate, es:
+<code bash>
+[root@ceph-osd-01 ~]# ceph daemon osd.3 dump_blocked_ops
+{
+    "ops": [],
+    "complaint_time": 30.000000,
+    "num_blocked_ops": 0
+}
+[root@ceph-osd-01 ~]#
+</code>
+----------------
+<code bash>
+ceph daemon osd.<id> dump_historic_ops
+</code>
+dice le operazioni piu` lente che ci sono state recentemente (ultimi 10 minuti ?)
+Indica anche il client, la durata dell'operazione, il dato coinvolto, es:
+<code>
+            "description": "osd_op(client.173092581.0:166224247 8.c0 8:034d4294:::rbd_data.35f31a7ea1cd63.00000000000368c4:head [sparse-read 3305472~516096] snapc 0=[] ondisk+read+kno
+wn_if_redirected e1198650)",
+            "initiated_at": "2019-02-05 14:24:55.541494",
+            "age": 13.102105,
+            "duration": 0.609200,
+            "type_data": {
+                "flag_point": "started",
+                "client_info": {
+                    "client": "client.173092581",
+                    "client_addr": "192.168.61.120:0/1047816369",
+                    "tid": 166224247
+</code>
+In questo caso il client e` 192.168.61.120 (cld-np-10) e l'immagine e` rbd_data.35f31a7ea1cd63
+Per vedere qual e`:
+<code bash>
+[root@ceph-mon-01 ~]#  for rbd in $(rbd ls -p volumes-prod); do rbd info volumes-prod/$rbd; done | grep -B3 -A2 rbd_data.35f31a7ea1cd63
+rbd image 'volume-24664fe3-a84c-41cd-b403-94adedc4adf2':
+	size 1000 GB in 256000 objects
+	order 22 (4096 kB objects)
+	block_name_prefix: rbd_data.35f31a7ea1cd63
+	format: 2
+	features: layering
+</code>
+Quindi il volume cinder 24664fe3-a84c-41cd-b403-94adedc4adf2 che in effetti e` attaccato su una VM ospitata su cld-np-10:
+<code bash>
+[root@cld-ctrl-01 ~]# cinder list --all | grep 24664fe3-a84c-41cd-b403-94adedc4adf2
+| 24664fe3-a84c-41cd-b403-94adedc4adf2 | 1c587619a84f417eabc011321fd559ec | in-use         | data004                   | 1000  | ceph             | false    | dfa2175b-8cdb-464d-a216-068b0cd8fc26 |
+[root@cld-ctrl-01 ~]# nova show dfa2175b-8cdb-464d-a216-068b0cd8fc26 | grep cld
+| OS-EXT-SRV-ATTR:host                 | cld-np-10.cloud.pd.infn.it                                                                                                                                       |
+| OS-EXT-SRV-ATTR:hypervisor_hostname  | cld-np-10.cloud.pd.infn.it                                                                                                                                       |
+| flavor                               | cldareapd.32cores64GB25GB (f30e59ba-b207-4d58-bc35-709208f7c6b9)                                                                                                 |
+[root@cld-ctrl-01 ~]#
+</code>
+If you run ceph daemon osd.<id> dump_historic_ops or ceph daemon osd.<id> dump_ops_in_flight, you will see a set of operations and a list of events each operation went through. These are briefly described below.