Hi, we are currently planning a new ceph cluster which will be used for virtualization (providing RBD storage for KVM machines) and we have some general questions. * Is it advisable to have one ceph cluster spread over multiple datacenters (latency is low, as they are not so far from each other)? Is anybody doing this in a production setup? We know that any network issue would affect virtual machines in all locations instead just one, but we can see a lot of advantages as well. * We are planning to combine the hosts for ceph and KVM (so far we are using seperate hosts for virtual machines and ceph storage). We see the big advantage (next to the price drop) of an automatic ceph expansion when adding more compute nodes as we got into situations in the past where we had too many compute nodes and the ceph cluster was not expanded properly (performance dropped over time). On the other side there would be changes to the crush map every time we add a compute node and that might end in a lot of data movement in ceph. Is anybody using combined servers for compute and ceph storage and has some experience? * is there a maximum amount of OSDs in a ceph cluster? We are planning to use a minimum of 8 OSDs per server and going to have a cluster with about 100 servers which would end in about 800 OSDs. Thanks for any help... Cheers Nick
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