What kind of Physical Security system most of the datacenter keeping it now. Do they normally keep secuiry person to scans people, whoever goes in and out?. Do they have any Battery backups for entry access system?. If you have any idea about it please let me know.
most DC i have been use a combination of card readers and bio-metrics such as a palm scanner. and most will have someone in charge of escorted access such as a security guard or technical personnel.