[Beowulf] Gigabit switches for Channel Bonding

[Ramiro Alba Queipo]

Hello everybody:


We have a cluster of 150 nodes, from which 48 are Dual core with 2
Gigabit
ethernet cards (24 of them are about to be purchased) and 24 are Single 
core with 2 Gigabit ethernet cards also. The rest are Single Core
processors
with a single Fast ethernet card.
We intend to setup a Channel Bonding Ethernet through Linux kernel with
the 48 Dual core nodes,so we need two buy 48 port stackable gigabit
switches, and should also be stacked (not an essential condition) to a
48 ports gigabit switch (HP Procurve 2848) we already have. The rest of
the nodes go to a Cisco Fast Ethernet switch.

The options we are evaluated (both are stackable) are:

- 3Com Switch 5500G, which can be stacked by buying modules with 1 port
10G or
  8 ports 1G. They say 48 Gbps stacking bandwith (96 Gbs full duplex)?? 

- HP Procurve 2900-48G. 10 Gb stacking bandwith (CX4 rear port)?

We are using the cluster to run MPI based applications, so it is very
important for us performance (latency) and stability at communications.

Which solution do advise?

Thanks in advance

Regards



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