Data Center Tier Definitions & Up time

Data Center Tier Definitions & Up time

Tier 1 to 4 data center is a standardized methodology used to define uptime of data center. 

This is useful for measuring:

·        Data center performance

·        Investment

·        Return on investment (ROI)

• Tier 1 (Basic Capacity) = Non-redundant capacity components (single uplink and servers).
• Tier 2 (Redundant Capacity Components) = Tier 1 + Redundant capacity components.
• Tier 3 (Concurrently Maintainable) = Tier 1 + Tier 2 + Dual-powered equipment’s and multiple uplinks.
• Tier 4 (Fault Tolerance) = Tier 1 + Tier 2 + Tier 3 + all components are fully fault-tolerant including uplinks, storage, chillers, HVAC systems, servers etc. Everything is dual-powered.

Uptime for Different Tier Data Centers

Tier	Uptime %	Total Downtime
Tier 1	99.671%	1729.224 minutes or 28.817 hours
Tier 2	99.741%	1361.304 minutes or 22.688 hours
Tier 3	99.982%	94.608 minutes or 1.5768 hours
Tier 4	99.995%	26.28 minutes or 0.438 hours