My company has a ~270 node cluster we're thinking of turning into a solo mining operation during downtime. Can anyone direct me to a comprehensive tutorial on how to set this up?
Do you have an estimate on how many TH/s this cluster can do? I would advise against solo mining unless you can manage to comprise at least 0.1% of the network hash rate, which currently (August 2015) would be about 50TH/s.
Even with pooled mining, it's probably a waste of time.
It may be profitable to mine some altcoin, but I am not familiar with all of them, and you have not mentioned any specs for your cluster or what you pay for electricity.