A SysOps administrator is managing a Memcached cluster in Amazon ElastiCache.

To upgrade the instance type of a Memcached cluster in Amazon ElastiCache due to increased usage and the need for more memory:

ModifyCacheCluster API: Utilize the ModifyCacheCluster API call. This API allows you to change various settings of an existing cache cluster, including the instance type, which is referred to as cacheNodeType.

Instance Upgrade: Specify a new, larger cacheNodeType that provides more memory. This upgrade will involve a brief interruption as nodes are replaced with the larger type, but it is necessary to accommodate the increased load and memory requirements.

Cluster Availability: Ensure that the Memcached cluster is configured for minimal downtime during this change. The upgrade process is handled by ElastiCache, and the new nodes will join the cluster with more memory capacity.

This approach enables you to effectively scale up the resources available to your Memcached cluster, enhancing its performance and capacity to handle larger workloads.