A design comparison hides a shared failure dependency
A fictional organization compares a validated converged stack with a proposed hyperconverged arrangement for a business service. Both proposals meet the supplied average compute demand, but the recovery requirement includes loss of the only shared identity service. Neither proposal’s worksheet has tested that dependency, and the total-cost comparison omits migration and operations. A colleague says the hyperconverged label proves automatic resilience and lower cost. Another asks for explicit dependency, peak-demand, lifecycle and recovery evidence. No infrastructure is purchased or deployed in this case. It asks the learner to compare actual designs against requirements rather than choose a label based on one average or a claim that integrated components remove every shared failure domain.
1. Which gaps prevent the unconditional conclusion?
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The shared identity failure, untested recovery, demand distribution and omitted lifecycle costs remain unresolved. An HCI label alone establishes none of those outcomes.
2. What would a defensible comparison include?
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Map requirements and assumptions to supported component dependencies, representative normal/failure tests, capacity reserves and full lifecycle costs. Record trade-offs and unresolved conditions before an authorized selection.