What it means
The cheapest unit price is not always the lowest total cost. Commitments, interruption risk, utilization, data transfer, operations, and workload flexibility must be considered together.
Why it matters
Purchasing choices can create savings or lock an organization into unused capacity and unsuitable architecture.
Practical focus
- Match purchasing models to stable and variable demand
- Understand interruption and commitment conditions
- Include licensing, support, and data transfer
- Revisit commitments as workloads change
Common mistakes
- Comparing only hourly compute prices
- Buying commitments based on forecasts with no accountability
- Using interruptible capacity for workloads that cannot recover
Certification relevance
This subject appears in or supports the following certification bodies of knowledge: