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From: Michael (mklus_at_[hidden])
Date: 2007-05-24 11:50:14


On May 24, 2007, at 10:38 AM, Adams, Samuel D Contr AFRL/HEDR wrote:

> We recently got 33 new cluster nodes all of which have two onboard
> GigE
> nics. We also got two powerconnect 2748 48 port switches which
> support
> IEEE 802.3ad (link aggregation). I have configured the nodes to do
> Ethernet bonding to aggregate the two nics in to one bonded device:
> ...
> Now I am wondering what is the best way to configure my switches. I
> guess I could do it in two ways: use the IEEE 802.3ab on the switch,
> plug both nics of a node into one switch, and have some nodes on
> either
> switch, or perhaps for each node, plug one nic in one switch and the
> second nic in the other switch.

Based on the configuration of a system that we purchased and our
experience with that system, I would say that one nic from each node
into one switch and the other nic from each node into the other
switch. This assumes the two switches have more ports than you have
nodes.

I have no experience with IEEE 802.3ab, someone else would have to
speak to that.

The question also is which bonding configuration you choose and which
choices would work and which gives the best performance.

Michael

---
"Producing a system from a specification is like walking on water-- 
it's easier if it's frozen."