Reliability classification of data center

TIA released ANSI/TIA-942 in 2005 and has since modified it in 2008 and 2010, respectively. This standard defines four levels (Tier) for data centers.

Tier 1:

Single path service IT device

No redundant parts

Basic infrastructure

Available time 99.671% (525600 minutes a year; service outage 1729.224 minutes)

Tier 2:

Meet or exceed the requirements of Tier 1

Redundant infrastructure and parts

Available time 99.741% (525600 minutes a year; service outage 1361.304 minutes)

Tier 3:

Meet the requirements of goods exceeding Tier 1 and Tier2

Multiple independent paths serve IT Devic

All IT devices must be dual power supplies and fully compatible with the topology of the site architecture

Have a maintainable site architecture at the same time

Available time 99.982% (525600 minutes a year; service outage time 94.608 minutes)

Tier 4:

Meet or exceed the requirements of Tier 1 to 3

All cooling equipment uses dual power supplies independently, including refrigeration and heating systems, ventilation and air conditioning systems.

Fault-tolerant site infrastructure and power storage capacity

Available time 99.995% (525600 minutes a year; service outage 26.28 minutes)

Other standards:

German Datacenter star audit program divides the data center into five levels

In addition to ANSI/TIA-942, Up-time Institute defines their own level 4 data center standards.