Hello,
>> I have a Ceph Nautilus Cluster 14.2.1 for cephfs only on 40x 1.8T SAS disk (no SSD) in 20 servers.
>>
>> I often get "MDSs report slow requests" and plenty of "[WRN] 3 slow requests, 0 included below; oldest blocked for > 60281.199503 secs"
>>
>> After a few investigations, I saw that ALL ceph-osd process eat a lot of memory, up to 130GB RSS each. It this value normal? May this related to
>> slow requests? Is disk only increasing the probability to get slow requests?
>
> If you haven't set:
>
> osd op queue cut off = high
>
> in /etc/ceph/ceph.conf on your OSDs, I'd give that a try. It should
> help quite a bit with pure HDD clusters.
OK I'll try this, thanks.
If I want to add this my ceph-ansible playbook parameters, in which files I should add it and what is the best way to do it ?
Add those 3 lines in all.yml or osds.yml ?
ceph_conf_overrides:
global:
osd_op_queue_cut_off: high
Is there another (better?) way to do that?
Thanks for your help.
Best regards,
--
Yoann Moulin
EPFL IC-IT
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