Internal Powerpack

I have spent the past few weeks helping Kirk write a proposal for a new cluster. Every node will be fully instrumented by Powerpack to measure power consumption. Powerpack at scale has a number of challenges, one of which is how to fit the instrumentation inside the case. We can't do this to an entire cluster:

One idea is to move the instrumentation into the spare disk drive space inside the case. Here is a diagram of what that looks like: