Calculate required regional capacity when a service must survive one zone loss while meeting peak demand.
Three-zone service peaks at 12,000 rpm. Each zone is SLO-safe up to 5,500 rpm. The team claims it can survive one zone loss. Functional redundancy means surviving capacity under failure still meets the SLO-safe demand. Counting zones instead of surviving capacity creates false confidence. A three-zone service can still fail if the two remaining zones exceed their safe envelope. Normal split 12,000 rpm / 3 zones = 4,000 rpm per zone under normal peak. Normal operation looks safe because 4,000 is below the 5,500 SLO-safe envelope. One-zone loss 12,000 rpm / 2 surviving zones = 6,000 rpm per zone. The…
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