1. Cooling.
2. Physical access and security.
3. Remote access, Lights out management, etc...
4. Environmental Monitoring.
5. Fire and Flood control
6. redundancy (mostly network and power)
7. method to physically access data center .. you'd be surprised, at some DC's it took me up to 20 minutes to get in at night because they only had one guy on shift and he has to also patrol and make rounds, not good if a server is down.
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