FWIW, I agree with the point you're making, vis-a-vis system resiliency. Ideally the system should be able to tolerate having a data center burn down. My comments above about the value of sprinklers are really addressing a separate issue, which is the immediate life hazard risk to the people working in the data center in the event of a fire. With my "firefighter hat" on so to speak, I don't really much care about the servers and the data in the short-term if there' a fire - I just care that everybody goes home safely.