Over-provisioned ElastiCache findings apply to clusters that are receiving traffic but run on a node type larger than memory and CPU metrics justify. This is different from idle ElastiCache findings, which flag clusters with near-zero cache traffic or connections.
Before you downsize
- Review cache hit rate, evictions, and memory usage over several days — downsizing during a quiet period can hide peak demand.
- Confirm no upcoming events (launches, sales, batch jobs) will spike memory or connection counts beyond the smaller node type's capacity.
- Plan the resize during a maintenance window; cluster mode and replica counts affect whether AWS can resize in place or requires replacement.
- Update application connection pools and timeouts if the smaller node type has different connection limits.
Paid plans include remediation scripts to modify the cluster node type. Monitor hit rate and latency after the change and be ready to roll back if evictions spike.
What triggers this finding
An ElastiCache cluster on a node type larger than its memory and CPU utilization metrics justify.
Typical fix
Downsize to a smaller node type during a maintenance window. Monitor cache hit rate and evictions after resizing.
Example savings
The difference between current and recommended node pricing — often 25–50% of cluster cost.
See also: Severity and savings estimates for how Parsivex calculates figures on your report.