If one node which happens to have a single raid 0 hardisk is "slow", would that impact the whole ceph cluster? That is, when VMs interact with the rbd pool to read and write data, would the kvm client "wait" for that slow hardisk/node to return with the requested data, thus making that slow hardisk/node the ultimate bottleneck? Or, would kvm/ceph be smart enough to get the needed data from whichever node is ready to serve it up? That is, kvm/ceph will request all possilbe osds to return data, but if one osd is "done" with its request, it can chose to return more data that the "slow" harddisk/node still hasn't returned....I'm trying to decide whether to remove the slow harddisk/node from the ceph cluster (depending on how ceph works).
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