Hello, First, let me advise I'm really a noob with Cephsince I have only read some documentation. I'm now trying to deploy a Ceph cluster for testing purposes. The cluster is based on 3 (more if necessary) hypervisors running proxmox 3.4. Before going futher, I have an essential question : is Ceph usable in a case of multiple sites storage ? Long story : My goal is to run hypervisors on 2 datacenters separated by 4ms latency. Bandwidth is 1Gbps actually but will be upgraded in a near future. So is it possible to run a an active/active Ceph cluster to get a shared storage between the two sites. Of course, I'll have to be sure that no machien is running at the same time on both sites. Hypervisor will be in charge of this. Is there a mean to ask Ceph to keep at least one copy (or two) in each site and ask it to make all blocs reads from the nearest location ? I'm aware that writes would have to be replicated and there's only a synchronous mode for this. I've read many documentation and use cases about Ceph and it seems some are saying it could be used in such replication and others are not. Need of erasure coding isn't clear too. Just hoping my english is clear enough to explain my case ;-) Thanks for your help, Julien Escario
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