Recommended node size for Ceph

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Hello,

Just a general question really. What is the recommended node size for Ceph with storage clusters? The Ceph documentation does say use more smaller nodes rather than fewer large nodes but what constitutes to large in terms of Ceph? Is it 16 OSD or more like 32 OSD?

Where does Ceph tail off in performance when having to many OSDs in servers?

For example: (generalisation)

7x 16 Drive/OSD Servers (with MON's mixed in)

or

10x 12 Drive/OSD Servers (with MON's mixed in)

Regards

Pieter
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