Diversify commitments
Mix EC2 and Compute SPs.
Always Rightsize and Upgrade before committing.
Purchase multiple commitments over time (every quarter) instead of a single monolithic.
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Measure Risk VS Discounts
The financial risks of committing to an AWS Savings Plan can be significant if usage predictions are inaccurate.
Do not purchase 3 years commitment for old instances types.
Do not overcommit – give security space for rightsizing.
Don’t buy in advance – always be a little behind.
Linux M5.large EC2 Instance
Other Best Practices…
Save more when you purchase from the Management account.
Monitor regularly the coverage and utilization reports (last day is crucial).
If utilization is <100%, look at uncovered instances and see if you can change instance type to match the unused commitment.
Get alerted when Commitments expire. They can be renewed automatically.
If you purchase a wrong commitment, contact immediately AWS Support.
