Reserved & Committed Capacity
Committing the baseline, laddering terms, and expiry as a silent failure.
4 to work through
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intermediate
A compute platform must choose between reserved commitments, on-demand and interruptible capacity. How should the mix be decided?
2 min answer -
intermediate
Finance wants a three-year commitment on cloud spend for the discount. Engineering is nervous. How do you advise?
2 min answer -
advanced
An AI platform must secure accelerator capacity where supply is constrained and demand is uncertain. How should reservations, on-demand and spot be combined?
2 min answer -
advanced
Finance proposes a three-year commitment covering 80% of current compute. Engineering is planning a container migration. Advise.
2 min answer
4 terms in this topic
Commitment Coverage
The proportion of steady-state usage covered by discounted commitments, balanced against the risk of committing to capacity that is no longer needed.
conceptCommitment Floor
The minimum spend a contract obliges you to pay regardless of usage, which makes efficiency gains unrealisable until the term ends and therefore sets…
practiceReserved and Committed Capacity
Trading a commitment to spend for a substantial discount, where the risk is committing to an architecture you are about to change.
practiceTrough-Based Commitment
Sizing reserved capacity to the quietest period rather than the average, because only the trough is capacity you are certain to use for the whole com…
Neighbouring topics
Cost & FinOps
General material on the economics of an architecture.
Total Cost of Ownership
Lifetime cost including people, operations, upgrades and exit.
Cloud Pricing Models
On-demand, committed and spot, and the crossover arithmetic.
Spot & Interruptible Capacity
Deep discounts for work that can be interrupted and resumed.
Unit Economics
Cost per request, per tenant, per transaction — the actionable number.
Cost per Request
Fully-loaded per-unit cost, including the lines usually left out.
Storage Costs
Tiering, lifecycle policies, retrieval charges and minimum durations.
Network & Egress Costs
Cross-zone and cross-region transfer that appears on no diagram.
Compute Optimisation
Instance families, utilisation, and architecture that wastes less.
Rightsizing
Matching provisioned resources to observed demand rather than to a guess.
Cost Allocation
Tagging enforced at provisioning, and apportioning shared costs.
Showback & Chargeback
Making teams see, or own, the cost of what they run.
Architecture Cost Modelling
Pricing a design before building it, at expected and at ten times volume.
Cost vs Reliability
Each nine costing an order of magnitude, and pricing the failure instead.
Observability Cost
Telemetry bills, cardinality control and retention tiering.
Licence & Vendor Costs
Per-core, per-seat and per-environment terms that shape designs.
FinOps Practice
Inform, optimise, operate — and cost as a design-review criterion.
Waste Elimination
Idle environments, orphaned volumes, forgotten instances, dead data.
Cost Governance
Budgets, anomaly alerts, quotas and preventive policy.