More about Data Center Tier Levels

You may refer to our previous discussion about Data Center Uptime and Tier Levels:
http://green-data.blogspot.com/2014/07/data-center-tier-levels-and-uptime.html


Let's evaluate the configuration of critical system / supply with the diagrams:


Tier I

Components capacity to support IT load is 100%
Single distribution path
Rack power < 1kW Multi-points of failure and human errors
Schedule maintenance twice per annum last for 12 hours
Availability 99.67%, annual down time max. 28.8 hours





Tier II

Components capacity to support IT load is N+1
Redundant for critical components
Single distribution path
Rack power < 2kW
Multi-points of failure and human errors
Schedule maintenance 3 times every 2 years each 12 hours
Availability 99.75%, annual down time max. 22 hours





Tier III

Components capacity to support IT load is N+1
Redundant for all components and distribution path
Allow concurrent maintenance
Rack power > 3kW
Require MV supply (11kV in Hong Kong)
Some failure points and human errors
Schedule maintenance not required
Availability 99.98%, annual down time max. 96 mins (Depends on the Situation)





Tier IV

Components capacity to support IT load is N after any failure
Dual active distribution path
No Single Point of Failure
Rack power > 4kW
Require MV supply (11kV in Hong Kong)
Fault Tolerant, Fire, EPO and human errors
Schedule maintenance not required
Availability 99.99%, annual down time max. 48 mins (Depends on the Situation)








The Blogger

Strategic Media Asia (SMA) is one of the CPD Course Providers of the Chartered Institution of Building Services Engineers (CIBSE).

SMA, a critical infrastructure training and event organizer based in Hong Kong, provides an interactive environment and opportunities for members of IDC industry and engineers to exchange professional views and experience on critical infrastructure and E&M facilities.

For details of other data center courses and seminars, please visit our website at http://www.stmedia-asia.com/trainings.html.