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.
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 1||TIER 2||TIER 3||TIER 4|
|Target customer||Small Business ||Small enterprise||Large enterprise||Very Large Org/MNC
|Component level redundancy||N||Partial |
N + 1
N + 1
2N + 1
|Distribution Paths||1||1||Fault Tolerant|
2N + 1
2N + 1
|Availability||99.671 %||99.749 %||99.982 %||99.995 %
|Downtime||28.8 Hrs||22 Hrs||1.6 Hrs||0.04 Hrs
|Staffing||None||1 Shift||1 + Shift||24 * 7 * 365
|Months to Implement||3||3-6||15-20||15-20|
|Year 1st deployed||1965||1970||1985||1995|
Download the comparison table here.
Related- Data Center Interconnect