A production tier peaks at 6,000 rps and must hold 99.95% availability with critical durability and p99 ≤ 140 ms — on a tight $1,100/mo budget. Watch what pure Spot capacity being reclaimable in bulk does to that availability number.
All challenges
Purchasing strategy under an SLA
advancedScenario & brief
6,000 rps peakp99 ≤ 140ms99.95% availdurability: criticalbudget $1,100/mo
App Servers
Compute
6instances
System health
Erupting · SLA breach
28
/ 100
Score
SLA not met yet
Monthly cost
$2,054
Budget $1,100/mo · $954 over
Metrics
Capacity57
Availability30
Durability25
Cost efficiency8
Requirements
- Peak capacity — 21600 rps compute · 3400 rps db (need ≥ 6000 rps)
- p99 latency — ~132 ms (need ≤ 140 ms)
- Availability — 99.00% (need ≥ 99.95%)
- Durability — at risk (need redundancy + backups)
- Budget — $2054/mo (need ≤ $1100/mo)
Advisor
- The database is saturated at peak — add a cache to shed read load, or scale it up.
- Compute runs in a single AZ — spread across ≥2 AZs (with ≥2 instances) to meet the availability target.
- The database has no Multi-AZ standby or replica — a failure risks data loss. Enable Multi-AZ and backups.
Discussion
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For learning purposes only. Costs and capacities are illustrative, not live AWS prices. Not affiliated with or endorsed by Amazon Web Services.