AWS News Blog
Amazon ElastiCache Flexible Node Placement
Amazon ElastiCache makes it easy for you to deploy an in-memory cache in the cloud using the Memacached or Redis engines.
Today we are launching a new flexible node placement model for ElastiCache. Your Memcached Cache Clusters can now span multiple Availability Zones within a Region. This will help to improve the reliability of the Cluster.
You can now choose the Availability Zone for new nodes when you create a new Cache Cluster or add more nodes to an existing Cluster. You can specify the new desired number of nodes in each Availability Zone or you can simply choose the Spread Nodes Across Zones option. If the cluster is within a Virtual Private Cloud (VPC) you can place nodes in Availability Zones that are part of the selected cache subnet group (read Creating a Cache Cluster in a VPC to learn more).
Here is how you control node placement when you create a new Cache Cluster using the Memcached engine:
Here is how you control zone placement when you add nodes to an existing cluster:
This new feature is available now and you can start using it today! To learn more, take a look at Managing Cache Clusters in the ElastiCache User Guide.