Am 27.06.2012 18:00, schrieb Mark Nelson:
On 06/27/2012 10:28 AM, Stefan Priebe wrote:
Well, as we said, 1GHz/OSD was a WAG (wild-ass guess), but 3.6GHz+/OSD
is farther outside of that range than I would have expected. It might
just be a consequence of using SSDs, since they can sustain so much more
throughput.
Sure it was just so much away from 1Ghz that i wanted to ask.
What is the cluster doing when you see those CPU usage numbers?
random write I/O from one KVM. 14k I/Ops with random 4k writes.
Stefan
I think I was seeing about 80-85% CPU utilization with 5 SSD OSDs on our
6-core AMD nodes, but I was just doing sequential writes with rados bench.
While doing sequential writes i see pretty low CPU usage. Random writes
is the problem.
Stefan
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