On Wed, Jun 14, 2023 at 01:44:40PM +0000, Szabo, Istvan (Agoda) wrote:
I have a dedicated loadbalancer pairs separated on 2x baremetal servers and
behind the haproxy balancers I have 3 mon/mgr/rgw nodes.
Each rgw node has 2rgw on it so in the cluster altogether 6, (now I just added
one more so currently 9).
Today I see pretty high GET latency in the cluster (3-4s) and seems like the
limitations are the gateways:
https://i.ibb.co/ypXFL34/1.png
In this netstat seems like maxed out the established connections around 2-3k.
When I've added one more gateway it increased.
Seems like the gateway node or the gateway instance has some limitation. What
is the value which is around 1000,I haven't really found it and affect GET and
limit the connections on linux?
It could be rgw_max_concurrent_requests[1] witch is default at 1024.
I read somewhere that it should not be increased, but could be increase it to
2048.
But the recommended action was to add more gateways instead.
[1]
https://docs.ceph.com/en/quincy/radosgw/config-ref/#confval-rgw_max_concurrent_requests
--
Kai Stian Olstad
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