A city is designing compute for a always-on citizen portal baseline plus a fault-tolerant batch that transcodes public meeting videos. Which purchasing mix best aligns cost with workload behavior?
Select an answer to reveal the explanation.
Short Explanation
Steady lights-on portal hours love Savings Plans; flaky-but-restartable video jobs love Spot. Locking RIs onto a weekend-only transcoder—or putting the whole citizen site on naked Spot—is the expensive (or embarrassing) mix-up.
Full Explanation
Savings Plans and Reserved Instances reduce unit cost for predictable continuous usage such as a citizen portal baseline. Spot Instances cut cost for fault-tolerant, restartable workloads like video transcoding when the architecture tolerates interruption and retries. Committing RIs to sparse batch fleets wastes commitment; On-Demand-only for known baselines forgoes discounts; Spot-only for a customer-facing portal without fallback violates availability expectations.