Typical Infosec security definition: Confidentiality, Integrity & Availability –
Availabiliity – Power & connectivity.
Be sure that redundant power supplies are actually plugged into separate power sources. Plugging dual power supplies into the same power bus is inviting failure.
Connectivity – don’t skimp to begin. Be sure that the users have a good experience from the beginning. Adding capacity can take 30 days or more so a bad end user experience could last for a while if not enough capacity is provisioned up front.
Confidentiality – be sure that who can access the systems is who they say they are and that they are limited in what they can do according to company policy and procedure.
Integrity – backups should be stored separate from the equipment. Don’t store the media in the same location as the data. Test the backups regularly to ensure they are doing what you think they are doing.
Physical access control – Access should be restricted to those who really need to be there, and sign-in procedures should be implemented for visitors. Also, food, drink and smoking must be prohibited inside the data center, and the data center should be monitored by CCTV cameras.