On 11/12/2012 05:50 AM, Stefan Priebe - Profihost AG wrote:
Hello list, are there any plans to optimize librbd for iops? Right now i'm able to get 50.000 iop/s via iscsi and 100.000 iop/s using multipathing with iscsi. With librbd i'm stuck to around 18.000iops. As this scales with more hosts but not with more disks in a vm. It must be limited by rbd implementation in kvm / librbd.
It'd be interesting to see which layers are most limiting in this case - qemu/kvm, librados, or librbd. How does rados bench with 4k writes and then 4k reads with many concurrent IOs do? Unfortunately there's no librbd read benchmark yet. Josh -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
