Ideal two-region active-active serving capacity factor for loss of either equal region
2× serving capacityderived
| Value kind | derived — Derived values are guide calculations; their result is only as fixed as the stated inputs, scope, and method. |
|---|---|
| Scope | Equal compatible regional throughput, full displaced-peak service, no second simultaneous regional loss. Storage, transfer, licenses, reservations and operating costs are priced separately. |
| As of | 2026-09 |
| Source | AWS Prescriptive Guidance states a typical multi-Region architecture can cost about twice a single-Region one and that hot standby doubles workload cost; the 2× here is a guide-derived capacity factor, so storage, transfer and licenses are priced separately. · Well-Architected Reliability Pillar REL13 DR patterns; Prescriptive Guidance Multi-Region fundamental 1 (cost paragraph) |
| Derivation | If total peak requires L units and either of two regions must serve L after peer loss, installed capacity is 2L. With r equal regions and one-region-loss protection, ideal installed capacity is rL/(r−1), before rounding and performance headroom. |
| Review | checking…review by 2027-09-05 · fast cadence |
| Recorded changes | last 2026-10-19 · 5 revisions tracked |
| Claim id | infrastructure-cost-of-active-active-carry-a |
Where the guide uses it
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