Tier 1 to 4 data center is nothing but a standardized methodology used to define uptime of data center. This is useful for measuring:
a) Data center performance
c) ROI (return on investment)
Tier 4 data center considered as most robust and less prone to failures. Tier 4 is designed to host mission critical servers and computer systems, with fully redundant subsystems (cooling, power, network links, storage etc) and compartmentalized security zones controlled by biometric access controls methods. Naturally, the simplest is a Tier 1 data center used by small business or shops.
Data Center Availability According To Tiers
The levels also describes the availability of data from the hardware at a location as follows:
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