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Tier classifications in a data center signify a standardized methodology used to describe site level infrastructure required to sustain data center infrastructure analyzing its expected availability (performance), functionality and capacity. - PowerPoint PPT Presentation
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Data center Tiers (I-IV) Explained
Data Center Tiers (I-IV) Classification as per Uptime Institute
What do Data center Tiers signify?
• Tier classifications in a data center signify a standardized methodology used to describe site level infrastructure required to sustain data center infrastructure analyzing its expected availability (performance), functionality and capacity.
The 4 Data Center Tiers
• Tier 1- Basic Data center Site Infrastructure
• Tier 2 - Redundant Site Infrastructure Capacity Components
• Tier 3- Concurrently Maintainable Site Infrastructure
• Tier 4- Fault Tolerant Site Infrastructure
Evaluation Parameters of Data Center Tiers
• The Tier number designation to any data center is based on the evaluation of following parameters
• Investment• ROI (return on investment)• Infrastructure
Tier 1- Data center Site Basic Infrastructure
• Expected Availability- 99.671% Uptime/year• No redundancy• 28.8 hrs of downtime/year• Susceptible to operational & human errors• Demands annual maintenance requiring site-
wide shutdown
Tier 2 - Redundant Site Infrastructure Capacity Components
• Expected Uptime- 99.749% Uptime/year• Partial redundancy in power and cooling• Experiences 22 hours of downtime/year• Susceptible to operational & human errors• Demands annual maintenance requiring site-
wide shutdown• Component removal doesn’t impacts
computer equipment
Tier 3- Concurrently Maintainable Site Infrastructure
• Expected availability- 99.982% Uptime/year • Max 1.6 hrs of downtime/year• N+1 fault tolerant providing at least 72 hours
power outage protection• Facility to manage maintenance periods without
affecting the continuity of service on the servers• Less susceptible to operational & human errors• Annual maintenance without operational
shutdowns
Tier 4- Fault Tolerant Site Infrastructure
• Expected availability- 99.995% Uptime/year • 2N+1 fully redundant & fault tolerant
infrastructure • 26.3 minutes downtime/year• Not susceptible to operational & human
errors• Annual maintenance without operational
shutdowns
Data Center Tiers Summed Up
• Tier 1 = Non-redundant capacity components (single uplink and servers).
• Tier 2 = Tier 1 + Redundant capacity components• Tier 3 = Tier 1 + Tier 2 + Dual-powered
equipment and multiple uplinks.• Tier 4 = Tier 1 + Tier 2 + Tier 3 + all components
are fully fault-tolerant including uplinks, storage, chillers, HVAC systems, servers etc.
Thank You
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