Data center Tiers (I-IV) Explained

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Data center Tiers (I-IV) Explained

• Data Center Tiers (I-IV) Classification as per
  Uptime Institute

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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.

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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

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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

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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

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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 doesnt impacts computer
  equipment

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Tier 3- Concurrently Maintainable Site
Infrastructure

• Expected availability- 99.982 Uptime/year
• Max 1.6 hrs of downtime/year
• N1 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

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Tier 4- Fault Tolerant Site Infrastructure

• Expected availability- 99.995 Uptime/year
• 2N1 fully redundant fault tolerant
  infrastructure
• 26.3 minutes downtime/year
• Not susceptible to operational human errors
• Annual maintenance without operational shutdowns

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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.

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