Migrating previous generation nodes
Previous generation nodes are node types that are being phased out. If you have no existing clusters using a previous generation node type, ElastiCache does not support the creation of new clusters with that node type.
Due to the limited amount of previous generation node types, we cannot guarantee a successful replacement when a node becomes unhealthy in your cluster(s). In such a scenario, your cluster availability may be negatively impacted.
We recommend that you migrate your cluster(s) to a new node type for better
availability and performance. For a recommended node type to migrate to, see Upgrade Paths
Migrating nodes on a Memcached cluster
To migrate ElastiCache (Memcached) to a different node type, you must create a new cluster, which always starts out empty that your application can populate.
To migrate your ElastiCache (Memcached) cluster node type using the ElastiCache Console:
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Create a new cluster with the new node type. For more information, see Creating a Memcached cluster (console).
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In your application, update the endpoints to the new cluster's endpoints. For more information, see Finding a Cluster's Endpoints (Console)
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Delete the old cluster. For more information, see Deleting a cluster