50 OSD on 10 nodes vs 50 osd on 50 nodes

[kevin parrikar <kevin.parker092@xxxxxxxxx>]

hello All,

I  have 50 compute nodes in my environment which are running virtual machines.I can add one more 10k RPM SAS disk and 1X10G interface to each server and thus there will be 50 OSD running on 50 compute nodes. Its not easy to obtain more servers for running Ceph  nor taking away servers from existing pool.

Question:

Will there be performance impact running 1 OSD process each on 50 servers vs 10 OSD process each on 5 servers?

I asked some of the guys who have worked on ceph in large scale before, but they all say i should run more OSD process per node to get performance over 1 OSD per node but they are not able to justify it.

can someone please clarify about the performance difference between these two.

Regards,

Kev

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