Calculators › Redundancy & availability
Redundancy & availability
Compare N, N+1, 2N redundancy topologies and uptime tiers: expected availability, downtime per year, and the capex premium each nine costs.
Redundancy topology & availability
Tier 3 · N+1, concurrently maintainable
Availability99.982%
Annual downtime≈1.6 h/yr
Relative capex≈1.4×
Typical useEnterprise / most AI training
Availability/downtime follow the Uptime Institute topology bands; the capex multiple is indicative (2N roughly doubles electrical/mechanical) → Ch 12.1.
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