Data Center Tier Classification Explained (Tier1,2,3 and 4)

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

Data Center Tier Classification

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

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

Related- Data Center vs Cloud

Tier 1 vs Tier 2 vs Tier 3 vs Tier 4

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

PARAMETERS
TIER 1TIER 2TIER 3TIER 4
Target customer
Small Business
Small enterprise
Large enterprise
Very Large Org/MNC
Component level redundancy
N
Partial
N + 1
Fault Tolerant
N + 1
Fault Tolerant
2N + 1
Distribution Paths
11Fault Tolerant
2N + 1
Fault Tolerant
2N + 1
Availability
99.671 %
99.749 %
99.982 %
99.995 %
Downtime
28.8 Hrs
22 Hrs
1.6 Hrs
0.04 Hrs
Compartmentalization
NoNoNoYes
Staffing
None1 Shift1 + Shift24 * 7 * 365
Concurrently maintainable
NoNoYesYes
Continuous cooling
NoNoNoYes
Months to Implement
33-615-2015-20
Year 1st deployed
1965197019851995

Download the comparison table here.

tier-4 tier 3 tier 2 tier 1

Related- Data Center Interconnect

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