Equipment Reliability
Whether the size of a living room or sprawling across tens of thousands of square metres, data centres need to operate around-the-clock. High quality and continuity of service are vitally important for facilities providing access to the digital economy. The security of the data centre and the data hosted there are key factors in allowing the entire web ecosystem to run smoothly.

How do you guarantee service continuity?
Data centre providers guarantee their facility‘s availability by ensuring an uninterrupted electrical and digital power supply and cooling their servers to prevent overheating. A data centre’s “TIER” is defined by its service continuity level over a defined period.
Each tier corresponds to different levels of equipment and availability.

• TIER 1 designates data centers with only one lane for the power supply and cooling, without element redundancy. These centers have an availability of 99,671%, corresponding to an average cumulative downtime of 28.8 hours per year.
• TIER 2 brings together data centers that also have a single channel for power supply and cooling, but with redundant elements to achieve availability from 99,749, or 22 hours off.
• TIER 3 has several supply and cooling channels, only one of which is active. Elements are doubled and maintenance can be frequent without stopping the machines. Uptime is 99,982%, or 1.6 hours of downtime per year.
• The TIER 4 is the most demanding: it has several active channels in parallel for the power supplies and cooling. Many infrastructure elements are doubled and "tolerant failures". Uptime is 99,995%, or 25 minutes of downtime per year.

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