Hi All,
  What are the pros and cons of running a virtual machine (with qemu-kvm) 
whose image is accessed via librbd or by mounting /dev/rbdX ?
  I've heard that the librbd method has the advantage of not being vulnerable 
to deadlocks due to memory allocation problems. ?
  Would one also benefit if using backported librbd to older kernels?  E.g. 
0.80 ceph with running on a 3.2.51 kernel should have bug fixes that the rbd 
module would not. ?
  Would one expect performance differences between librbd and module rbd?

Thanks!
Chad.
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