Changing the number of replicas - Amazon ElastiCache for Redis
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Changing the number of replicas

You can dynamically increase or decrease the number of read replicas in your Redis replication group using the Amazon Web Services Management Console, the Amazon CLI, or the ElastiCache API. If your replication group is a Redis (cluster mode enabled) replication group, you can choose which shards (node groups) to increase or decrease the number of replicas.

To dynamically change the number of replicas in your Redis replication group, choose the operation from the following table that fits your situation.