What is a Tier?
Tier is a data center reliability level by the Uptime Institute (I–IV). The higher the level, the more redundancy (power, cooling, network) and reliability.
Tier levels
| Tier | Reliability |
|---|---|
| Tier I | Basic, no redundancy |
| Tier II | Partial redundancy |
| Tier III | N+1, maintenance without downtime |
| Tier IV | Fully redundant (2N) |
Why Tier III is optimal
Tier III is the most balanced choice for reliability and cost: redundant power and cooling, maintenance without downtime and high uptime (around 99.98%+). It is reliable enough for critical sites, 1C, stores and corporate apps.
Epro.io and Tier III
Epro.io hardware is in Baku, in the Delta Telecom Tier III data center, certified for both Design and Constructed Facility (both the design and the built facility were verified). This means 99.9% SLA, redundant power/cooling and physical security.
FAQ
What uptime does Tier III give?
Around 99.98%+; Epro.io service SLA is 99.9%.
Why not Tier IV?
Tier IV is far more expensive and unnecessary for most businesses; Tier III balances reliability and cost.
Where is the server located?
In Baku, in the Delta Telecom Tier III data center — within Azerbaijan.
Found an error or have a question?
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