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Cloud Computing · Intermediate

Warm Standby

DR strategy running a scaled-down but fully functional copy of production in another site, scaled up on failover.

Definition

Warm standby keeps all components running at reduced capacity in the recovery region, so it can handle traffic immediately and scale to full size, achieving RTOs of minutes. It costs more than pilot light but less than active-active.

Example

A secondary region runs two small web servers and a replica database; during failover Auto Scaling increases capacity to 20 servers.

Exam tip

If the scenario says the DR environment can serve some traffic immediately, it is warm standby, not pilot light.

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