Amazon ElastiCache for Redis
ElastiCache for Redis User Guide (API Version 2015-02-02)

Managing Nodes

A node is the smallest building block of an Amazon ElastiCache deployment. It is a fixed-size chunk of secure, network-attached RAM. Each node runs the engine that was chosen when the cluster or replication group was created or last modified. Each node has its own Domain Name Service (DNS) name and port. Multiple types of ElastiCache nodes are supported, each with varying amounts of associated memory and computational power.

Generally speaking, due to its support for sharding, Redis (cluster mode enabled) deployments will have a number of smaller nodes while Redis (cluster mode disabled) deployments will have fewer larger nodes in the cluster. See Choosing Your Node Size for a more detailed discussion of which node size to use.

Other ElastiCache Node Operations

Additional operations involving nodes: