Hello,
If anybody out there has tried this or thought about it, I'd like to know...
I've been thinking about ways to squeeze as much performance as possible
from the NICs on a Ceph OSD node. The nodes in our cluster (6 x OSD, 3
x MGR/MON/MDS/RGW) currently have 2 x 10GB ports. Currently, one port
is assigned to the front-side network, and one to the back-side
network. However, there are times when the traffic on one side or the
other is more intense and might benefit from a bit more bandwidth.
The idea I had was to bond the two ports together, and to run the
back-side network in a tagged VLAN on the combined 20GB LACP port. In
order to keep the balance and prevent starvation from either side it
would be necessary to apply some sort of a weighted fair queuing
mechanism via the 'tc' command. The idea is that if the client side
isn't using up the full 10GB/node, and there is a burst of re-balancing
activity, the bandwidth consumed by the back-side traffic could swell to
15GB or more. Or vice versa.
From what I have read and studied, these algorithms are fairly
responsive to changes in load and would thus adjust rapidly if the
demand from either side suddenly changed.
Maybe this is a crazy idea, or maybe it's really cool. Your thoughts?
Thanks.
-Dave
--
Dave Hall
Binghamton University
kdhall@xxxxxxxxxxxxxx
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