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The CERN cloud is split between Geneva and Hungary (around 1,300 Kms). We use cells to maintain localisation of message queue traffic so that the Budapest centre has a cell with around 600 servers and the Geneva site has 3 cells, each with over 700 servers.

We have not seen significant impacts of distance using this approach although we are still working to tune ceilometer configurations as this can be quite latency dependent over the WAN lines and the keystone service is in Geneva.