Wednesday, May 2, 2007

more of what I do

So, I am rewiring 4 of the 8 infiniband switches on our "old" cluster this week:
This is just half of the entire network, which connects over 4000 nodes to each other on 8 different paths, so that any time, every node has 8 places to go for communication.

Above is a finished rack with two switches in it.
And in this shot above, is the rack I am currently working on. We had to re-wire them because the subnet manager couldn't handle the way the cables were placed, and performance (latency) was really being negatively affected. If you order them *exactly* the opposite of what we did, the entire system runs almost 2x as fast.

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