Warm standby, also known as fully working low capacity standby, is like the next level of the pilot light. It is the option where you use the agility of the cloud to provide low-cost DR. It increases the cost but also allows data to recover more quickly by having a small subset of services already running.
You can decide whether your disaster recovery environment should be enough to accommodate 30% or 50% of production traffic. Alternatively, you can also use this for non-production testing.
As shown in the following diagram, in the warm standby method, two systems are running—the central system and a low-capacity system—on a cloud such as AWS. You can use a router such as Amazon Route 53 to distribute requests between the central system and the cloud system:
When it comes to a database, warm standby has a similar approach to pilot light, where data is continuously replicating from...