Decreasing read capacity - Amazon ElastiCache for Redis
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Decreasing read capacity

To decrease read capacity, delete one or more read replicas from your Redis cluster with replicas (called replication group in the API/CLI). If the cluster is Multi-AZ with automatic failover enabled, you cannot delete the last read replica without first disabling Multi-AZ. For more information, see Modifying a replication group.

For more information, see Deleting a read replica, for Redis (Cluster Mode Disabled) replication groups .