Cache Cluster

A cache cluster is a collection of one or more cache nodes, each running an instance of the Memcached service. Most of your operations will be performed at the cache cluster level. A cache cluster can be set up with a specific number of cache nodes and a cache parameter group that controls the properties for each cache node. All cache nodes within a cache cluster are designed to be of the same Node Type and have the same parameter and security group settings.

Every cache cluster must haver a cache cluster identifier. The cache cluster identifier is a customer-supplied "name" for the cache cluster. This identifier specifies a particular cache cluster when interacting with the ElastiCache API and commands. The cache cluster identifier must be unique for that customer in an AWS region.