How to use hardware

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Hi everyone, 

In the purpose to deploy a medium size of ceph cluster (300 OSD) we have 6
bare-metal server for the OSD, and 5 bare-metal server for the service
(MDS, Mon, etc.)

Those 5 bare-metal server have each 48 cores and 256 Gb. 

What would be the smartest way to use those 5 server, I see two way : 

  first : 

    Server 1 : MDS,MON, grafana, prometheus, webui
    Server 2:  MON
    Server 3:  MON
    Server 4 : MDS
    Server 5 : MDS

  so 3 MDS, 3 MON. and we can loose 2 servers.

  Second 

    KVM on each server
      Server 1 : 3 VM : One for grafana & CIe, and 1 MDS, 2 MON
      other server : 1 MDS, 1 MON

  in total :  5 MDS, 5 MON and we can loose 4 servers. 

So on paper it's seem the second are smarter, but it's also more complex,
so my question are «is it worth the complexity to have 5 MDS/MON for 300
OSD». 

Important : The main goal of this ceph cluster are not to get the maximum
I/O speed, I would not say the speed is not a factor, but it's not the main
point. 

Regards.


-- 
Albert SHIH 🦫 🐸
Observatoire de Paris
France
Heure locale/Local time:
ven. 17 nov. 2023 10:49:27 CET
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