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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