optmize librbd for iops

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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.

Greets,
Stefan
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