The Uptime Institute categorises the datacentres by four levels: Tier I, II, III and IV. These levels correspond to a certain number of guarantees on the type of hardware deployed in the datacentre to ensure redundancy.
28.8 hours of interruption/year
22 hours of interruption/year
1.6 hours of interruption/year
0.8 hours of interruption/year
What's the difference between a Tier 3 and a Tier 4 datacentre?
A Tier III datacentre offers 99.98% availability.
With this configuration, it is possible to manage maintenance periods without affecting the continuity of service on the servers. However, these datacentres will not be protected from outages in the event of serious incidents occurring on different infrastructure components. In other words, the Tier III datacentres do not have total modular redundancy.
The highest level of guarantee that a datacenter can provide, with 99.99% availability.
This datacentre category is fully redundant in terms of electrical circuits, cooling and network. This architecture can withstand even the most serious of technical incidents without server availability ever being affected.
Your server connectors and components
|Supply||1||1 + 1|
|Power source||1 + 1||1 + 1|
In T4, your server
- doubles the power supply in direct connections
- has 2 processors
- authorises hot-swap disk changes
The major advantage of this feature is being able to upgrade a disk or replace a faulty component (RAID disk, power supply) without any service interruption on the server.