RahulPatel–twikies…

November 22, 2008

Data Center Tiers Definitions

Filed under: My Knowledge — Rahul Patel @ 4:24 am

Tier 1 Data Center Infrastructure
Basic Data Center

A Tier 1 data center is a basic data center with no redundancy. It has a single path for power, cooling,
and communications distribution with no redundant components. Uninterruptible Power Supply (UPS) is
provided for orderly shutdown of data center upon infrastructure failure. There is no fire detection and
suppression requirements other than code requirements for the building itself. Industrial grade locks are
required to secure access to spaces and components. Uptime availability is typically 99.67%, not
including planned shutdowns for systems maintenance.

Tier 2 Data Center Infrastructure
Redundant Components

A Tier 2 data center has redundant components but only single path distribution for power, cooling, and
communications. Standby generation and UPS are provided to provide continuous Data Center operation
upon a single-point infrastructure failure. Fire detection and suppression are provided to minimize Data
Center downtime due to fire or component failure. Card access and intrusion detection systems are
provided to secure spaces and components. Uptime availability is typically 99.75%, not including planned
shutdowns for systems maintenance.

Tier 3 Data Center Infrastructure
Concurrently Maintainable

A Tier 3 data center has dual power, cooling and communications paths, but only one path active.
Because redundant components are not limited to a single path, the system is concurrently maintainable.
Standby generation and UPS are provided to provide continuous Data Center operation upon a single-
point infrastructure failure. A fire detection system is required and pre-action suppression is provided
when required. Card access, intrusion detection, and CCTV systems are provided to secure spaces and
components. Uptime availability is typically 99.98%, including planned shutdowns for systems
maintenance.

Tier 4 Data Center Infrastructure
Fault Tolerant

A Tier IV data center has dual active power, cooling and communications paths. Because both paths are
active the infrastructure provides a high degree of fault tolerance. Standby generation and UPS are
provided to provide continuous Data Center operation upon a single-point infrastructure failure. A fire
detection system is required and pre-action suppression is provided when required. Card access,
intrusion detection, and CCTV systems are provided to secure spaces and components. Uptime
availability is typically 99.995%, including planned shutdowns for systems maintenance.

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