About IDC data center computer room construction T1, T2, T3, T4 level standard introduction

Tier I-Infrastructure data center computer room: no redundant facilities (can provide 99.67% availability, up to 28.8 hours of downtime per year)

T1 data center provides computer room infrastructure to support information technology outside the office environment. T1 data center infrastructure includes a space dedicated to IT systems; uninterruptible power supply (UPS) to filter power spikes, voltage sags and instantaneous power outages; dedicated cooling equipment that does not shut down at the end of normal office hours; and engine generators to protect IT functions from long power outages.

Tier II-Redundant capacity facility data center computer room: with redundant facilities, (can provide 99.75% availability, up to 22 hours of downtime per year)

T2 data center computer room facilities include all T1-level functions and add redundant critical power and cooling components to provide selected maintenance opportunities and increased safety margins to prevent IT process interruptions caused by computer room infrastructure equipment failures. Redundant components include power and cooling equipment such as UPS modules, cooling equipment, and engine generators.

Tier III-Concurrently maintainable data center room: multiple paths are available, only one path is in operation, with redundant facilities, and can be maintained simultaneously (providing 99.98% availability, with a maximum of 1.6 hours of downtime per year)

T3 data centers include all T1 and T2 features and do not require equipment shutdown for replacement and maintenance. Redundant transmission paths for power and cooling are added to the redundant key components of the T2 data center so that each component required to support the IT processing environment can be shut down and maintained without affecting IT operations.

Tier IV-Fault-tolerant data center room: with redundant equipment and fault-tolerant capabilities, (providing 99.99% availability, with a maximum of 0.8 hours of downtime per year)

T4 data center infrastructure is built on top of the T3 level, adding the concept of fault tolerance to the room infrastructure topology. Fault tolerance requires that all power and cooling components are 2N fully redundant. If any single power or cooling infrastructure component fails, processing will continue without interruption. Only failure of components from two different electrical or cooling paths can affect IT processing.