Cloud & Infrastructure Practical By Samson Tanimawo, PhD Published May 17, 2026 4 min read

The Spot Fleet Diversification Strategy

Single-instance-type spot fleets get hit hard during interruptions. Diversify across types and AZs to keep capacity stable.

Instance type diversity

Pick 3+ instance types of similar size and capability. m5, m5a, m5n, m6i.

Interruption probability per type is independent. Diversification reduces aggregate risk.

Across all AZs in the region. Spot pricing differs by AZ; AZ-balanced fleet smooths cost.

Some workloads have AZ-affinity needs. Plan accordingly.

capacity-optimized: best for stability.

lowest-price: best for cost; higher interruption rate.