Hi all,
I've only been using ceph for a few months now and currently have a small
cluster (3 nodes, 18 OSDs). I get decent performance based upon the
configuration.
My question is, should I have a larger pipe on the client/public network or on
the ceph cluster private network? I can only have a larger pipe on one of the
two. The most Ceph nodes we'd have in the foreseeable future is 7, current
client VM Host count is 3 with a max of 5 in the future.
Currently I can near about max out the throughput on the larger pipe with the
read, but not even close on the write when the larger pipe is connected to the
public/client side when benchmarking with rados. The smaller pipe, I still max
out with read, but still not close with the write (well, close being relative
to how many replications, if I use 2 replications, I can get 60% of theoretical
max, 3 replications I get about 40% when using the smaller pipe on the
client/public side).
Basically, I'm not sure how to determine when I'm getting to a point of when
the back end cluster private network starts to become the bottleneck that needs
to be expanded.
-Tony
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