ABSTRACT
When considering the tiered classifications of the
Uptime Institute and others, it should be noted that a high
rating applies only to the availability of the data and
redundancy of the supporting systems. The Uptime
Institute’s tiered rating does not incorporate the potentially
catastrophic effects of failure with the other two founda-
tions of the CIA (confidentiality, integrity, and availabil-
ity) triad. This entry deals primarily with the physical
security strategies, processes, roles, and equipment neces-
sary to protect the availability of the mission-critical facil-
ity and data center; however, much of the text also address
one or more areas of physical security, including access
control, surveillance, and perimeter protection. The predo-
minant theme for this entry is prevention.
