Hi,
One of my ceph nodes have flapping OSDs, network between nodes are fine, it's on a 10GBase-T network. I don't see anything wrong with the network, but these OSDs are going up/down.
[root@avatar0-ceph4 ~]# ceph osd tree
# id weight type name up/down reweight
-1 174.7 root default
-2 29.12 host avatar0-ceph2
16 3.64 osd.16 up 1
17 3.64 osd.17 up 1
18 3.64 osd.18 up 1
19 3.64 osd.19 up 1
20 3.64 osd.20 up 1
21 3.64 osd.21 up 1
22 3.64 osd.22 up 1
23 3.64 osd.23 up 1
-3 29.12 host avatar0-ceph0
0 3.64 osd.0 up 1
1 3.64 osd.1 up 1
2 3.64 osd.2 up 1
3 3.64 osd.3 up 1
4 3.64 osd.4 up 1
5 3.64 osd.5 up 1
6 3.64 osd.6 up 1
7 3.64 osd.7 up 1
-4 29.12 host avatar0-ceph1
8 3.64 osd.8 up 1
9 3.64 osd.9 up 1
10 3.64 osd.10 up 1
11 3.64 osd.11 up 1
12 3.64 osd.12 up 1
13 3.64 osd.13 up 1
14 3.64 osd.14 up 1
15 3.64 osd.15 up 1
-5 29.12 host avatar0-ceph3
24 3.64 osd.24 up 1
25 3.64 osd.25 up 1
26 3.64 osd.26 up 1
27 3.64 osd.27 up 1
28 3.64 osd.28 up 1
29 3.64 osd.29 up 1
30 3.64 osd.30 up 1
31 3.64 osd.31 up 1
-6 29.12 host avatar0-ceph4
32 3.64 osd.32 up 1
33 3.64 osd.33 up 1
34 3.64 osd.34 up 1
35 3.64 osd.35 up 1
36 3.64 osd.36 up 1
37 3.64 osd.37 up 1
38 3.64 osd.38 up 1
39 3.64 osd.39 up 1
-7 29.12 host avatar0-ceph5
40 3.64 osd.40 up 1
41 3.64 osd.41 up 1
42 3.64 osd.42 up 1
43 3.64 osd.43 up 1
44 3.64 osd.44 up 1
45 3.64 osd.45 up 1
46 3.64 osd.46 up 1
47 3.64 osd.47 up 1
[root@avatar0-ceph4 ~]#
Here is my ceph.conf
---
[root@avatar0-ceph4 ~]# cat /etc/ceph/ceph.conf
[global]
fsid = 2f0d1928-2ee5-4731-a259-64c0dc16110a
mon_initial_members = avatar0-ceph0, avatar0-ceph1, avatar0-ceph2
mon_host = 172.40.40.100,172.40.40.101,172.40.40.102
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
filestore_xattr_use_omap = true
osd_pool_default_size = 2
osd_pool_default_min_size = 1
cluster_network = 172.50.50.0/24
public_network = 172.40.40.0/24
max_open_files = 131072
mon_clock_drift_allowed = .15
mon_clock_drift_warn_backoff = 30
mon_osd_down_out_interval = 300
mon_osd_report_timeout = 300
mon_osd_min_down_reporters = 3
[osd]
filestore_merge_threshold = 40
filestore_split_multiple = 8
osd_op_threads = 8
osd_max_backfills = 1
osd_recovery_op_priority = 1
osd_recovery_max_active = 1
[client]
rbd_cache = true
rbd_cache_writethrough_until_flush = true
---
Here's the log snippet on osd.34
---
2017-04-02 22:26:10.371282 7f1064eab700 0 -- 172.50.50.105:6816/117130897 >> 172.50.50.101:6808/190698 pipe(0x156a1b80 sd=124 :46536 s=2 pgs=966 cs=1 l=0 c=0x13ae19c0).fault with nothing to send, going to standby
2017-04-02 22:26:10.371360 7f106ed5c700 0 -- 172.50.50.105:6816/117130897 >> 172.50.50.104:6822/181109 pipe(0x1018c2c0 sd=75 :34196 s=2 pgs=1022 cs=1 l=0 c=0x1098fa20).fault with nothing to send, going to standby
2017-04-02 22:26:10.371393 7f1067ad2700 0 -- 172.50.50.105:6816/117130897 >> 172.50.50.103:6806/118813 pipe(0x166b5c80 sd=34 :34156 s=2 pgs=1041 cs=1 l=0 c=0x10c4bfa0).fault with nothing to send, going to standby
2017-04-02 22:26:10.371739 7f107137b700 0 -- 172.50.50.105:6816/117130897 >> 172.50.50.103:6815/121286 pipe(0xd7eb8c0 sd=192 :43966 s=2 pgs=1042 cs=1 l=0 c=0x12eb7e40).fault with nothing to send, going to standby
2017-04-02 22:26:10.375016 7f1068ff7700 0 -- 172.50.50.105:6816/117130897 >> 172.50.50.104:6812/183825 pipe(0x10f70c00 sd=61 :34442 s=2 pgs=1025 cs=1 l=0 c=0xb10be40).fault with nothing to send, going to standby
2017-04-02 22:26:10.375221 7f107157d700 0 -- 172.50.50.105:6816/117130897 >> 172.50.50.102:6806/66401 pipe(0x10ba78c0 sd=191 :46312 s=2 pgs=988 cs=1 l=0 c=0x6f8c420).fault with nothing to send, going to standby
2017-04-02 22:26:11.041747 7f10885ab700 0 log_channel(default) log [WRN] : map e85725 wrongly marked me down
2017-04-02 22:26:16.427858 7f1062892700 0 -- 172.50.50.105:6807/118130897 >> 172.50.50.105:6811/116133701 pipe(0xd4cb180 sd=257 :6807 s=0 pgs=0 cs=0 l=0 c=0x13ae07e0).accept connect_seq 0 vs existing 0 state connecting
2017-04-02 22:26:16.427897 7f1062993700 0 -- 172.50.50.105:6807/118130897 >> 172.50.50.105:6811/116133701 pipe(0xfb50680 sd=76 :56374 s=4 pgs=0 cs=0 l=0 c=0x174255a0).connect got RESETSESSION but no longer connecting
---
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