Ceph data locality

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Hi,

I need a help to configure clients to write data to the primary osd on the local server.

I have a cluster with 20 nodes and on each server I have a client which writes/reads data to/from Ceph cluster (typical OpenStack installation with Ceph on each compute node).

I see a lot of networking when VM is trying to read data which was written by the same VM,

In order to solve the issue I've change the object size to 64MB.

The networking is still very high.

What I'm expecting to is the VM to read data from the local machine as the first replica of the data.

How to configure the CRUSH rules to make it happen?

Thank you very much,

Dmitry

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