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
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