I have had no luck with port aggregation so far and are not sure if what I see is the expected behavior.
This is what I would like:
aggregate 4 GBit Ethernet Port of a 4 Port Ethernet PCI Card in a Xserve (Intel) running 10.7.3 Server into one logical port with one IP address to get more bandwidth. My expectation is, that this port should have more thru put than a port with a single GBit Ethernet line.
But this is not what I see. My Switch is capable of handling port aggregation and when I check the aggregated port all physical lines have a green light at sent/receive. I am able to select different modes for the switch (xor, dmac, smac) but it doesnt make any difference.
What I see is NOT an aggregation of bandwidth, I only see an aggregation for fault tollerance.
So if I have 4 Computers copying data to the aggregated port on the server at the same time I only see around 25Mb/s on each computer. So the computers share a 1GBit line on the server even though there are 4.
If I configure the 4 ethernet port individually with 4 IP addresses I get around 90Mb/s on each computer.
The Server is capable to serve and receive around 400Mb/s onto the 16TB Raid drive.
Does anyone have an idea if this is the right behavior or if I am doing something wrong?