where does 100% RBD utilization come from?

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oops.
I posted this to the "Old" list, but supposedly this is the new list and the better place to ask questions?

A google search didnt seem to find the answer on this, so thought I'd ask here:

what determines if an rdb is "100% busy"?

I have some backend OSDs, and an iSCSI gateway, serving out some RBDs.

iostat on the gateway says rbd is 100% utilized

iostat on individual OSds only goes as high as about 60% on a per-device basis.
CPU is idle.
Doesnt seem like network interface is capped either.

So.. how do I improve RBD throughput?


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