TIER 1, TIER 2, TIER 3, TIER 4 DATA CENTER CLASSIFICATION

tier-1-tier-2-tier-3-tier-4-data-center-classification

When organizations plan to move key Business applications and services to a Data Center, the key term that is comes fore is the Tiering Standard. The Tiering of Data Center standards exists to evaluate the quality and reliability of a data center’s server hosting ability.

Data Center Tiering was introduced by Uptime Institute where the Data Centers were classified into 4 Tiers – Tier 1, Tier 2, Tier 3 and Tier 4. The classification is an indication of level of design or construction to a datacenter’s overall availability and system redundancy. Tier 4 ranking is the highest benchmark for of reliability of a data center.

Below are the key ingredients of 4 tiers of data Center (Tier 1, Tier 2, Tier 3 and Tier 4).

TIER 1 DATA CENTER –

  • 99.671% Uptime
  • no redundancy
  • 28.8 Hours of downtime per year.

TIER 2 DATA CENTER –

  • 99.749% Uptime
  • Partial (N+1) redundancy of components
  • 22 hours of downtime per year

TIER 3 DATA CENTER –

  • 99.982 % Uptime
  • Fault Tolerant (N+1) redundancy of components
  • 1.6 hours of downtime per year

TIER 4 DATA CENTER –

  • 99.995 % Uptime
  • Fault Tolerant (2N+1) redundancy of components
  • 0.04 hours of downtime per year

Below table enumerates How the 4 Tier Standards of Data Centers differ from each other –

tier-1-tier-2-tier-3-tier-4-data-center-classification

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