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I think it’s essential for huge data clusters to deal with data locality. Even very expensive network stack (100Gb/s) will not mitigate the problem if you need to move petabytes of data many times a day. Maybe there is some workaround to the problem? From: Van Leeuwen, Robert [mailto:rovanleeuwen@xxxxxxxx]
> I need a help to configure clients to write data to the primary osd on the local server. > I see a lot of networking when VM is trying to read data which was written by the same VM, > 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? This functionality is not in Ceph. Ceph has no notion about locality: faster "local nodes" vs slower “remote nodes". The only thing you can configure is a failure domain which just makes sure the data is properly spread across the DC. Cheers, Robert van Leeuwen |
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