slow requests are blocked > 32 sec. Implicated osds 0, 2, 3, 4, 5 (REQUEST_SLOW)

[BASSAGET Cédric <cedric.bassaget.ml@xxxxxxxxx>]

Hello,

I see messages related to REQUEST_SLOW a few times per day.

here's my ceph -s  :

root@ceph-pa2-1:/etc/ceph# ceph -s
  cluster:
    id:     72d94815-f057-4127-8914-448dfd25f5bc
    health: HEALTH_OK
 
  services:
    mon: 3 daemons, quorum ceph-pa2-1,ceph-pa2-2,ceph-pa2-3
    mgr: ceph-pa2-3(active), standbys: ceph-pa2-1, ceph-pa2-2
    osd: 6 osds: 6 up, 6 in
 
  data:
    pools:   1 pools, 256 pgs
    objects: 408.79k objects, 1.49TiB
    usage:   4.44TiB used, 37.5TiB / 41.9TiB avail
    pgs:     256 active+clean
 
  io:
    client:   8.00KiB/s rd, 17.2MiB/s wr, 1op/s rd, 546op/s wr
 

Running ceph version 12.2.9 (9e300932ef8a8916fb3fda78c58691a6ab0f4217) luminous (stable)

I've check : 

- all my network stack : OK ( 2*10G LAG )

- memory usage : ok (256G on each host, about 2% used per osd)

- cpu usage : OK (Intel(R) Xeon(R) CPU E5-2678 v3 @ 2.50GHz)

- disk status : OK (SAMSUNG   AREA7680S5xnNTRI  3P04 => samsung DC series)

I heard on IRC that it can be related to samsung PM / SM series.

Do anybody here is facing the same problem ? What can I do to solve that ?

Regards,

Cédric

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