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dev.perf-failover-time Calculator
Calculates expected failover time for a database or service from replication lag, health check interval, and DNS TTL in a application performance engineering context. RDS Multi-AZ failover typically takes 60–120 seconds — the primary fails, the standby is promoted, and DNS is updated. Applications must handle connection errors during this window.
Inputs
Detect
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Promote
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Reconnect
Reference formula or conversion factor shown for context.
Results
raw failover
Failover time without optimisation — the baseline recovery time before redundancy or pre-warming improvements.
RTO estimate (30% margin)
The value at the specified point or condition.
availability hit
Reduction in service availability caused by failures or maintenance. Every nine of availability (99% vs 99.9%) changes the allowed downtime by 10x.
total (seconds)
The combined total across all inputs and components.