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Install iPerf on all compute nodes. Note that iPerf is already installed on all Isilon nodes. All versions should match.
cat hosts | xargs -i -P 0 ssh root@{} yum -y install \
iperf-2.0.4-1.el7.rf.x86_64.rpm
cat hosts | xargs -i -P 0 ssh root@{} pkill -9 iperf
cat hosts | xargs -i ssh root@{} "iperf --server --daemon > /dev/null 2>&1 &"
client_opts="-t 300 --len 65536 --parallel 2"
ssh root@isilon-1.example.com iperf -c server1.example.com ${client_opts} &
ssh root@isilon-2.example.com iperf -c server2.example.com ${client_opts} &
wait
To view the aggregate bandwidth, run the following on any Isilon node.
isi statistics system --format top --nodes all