Cache server statistics are tracked by cluster hit rates and storage usage. Hits represent the data required for the transaction that was found in the cache. This data is tracked in terms of local counts and cluster-wide counts of voice mail messages.
Local cache is the cache on the application server being viewed. For example, Voicemail, Local is the local cache statistics for voice mail elements.
Cluster cache refers to the collective cache of the cluster, that is, all application servers in the cluster. In a single application server, local and cluster cache are the same.
Cluster statistics include statistics based on inbound cache requests from other application servers in the same cluster. Cluster statistics are the same on all application servers in the cluster.
In terms of storage usage, the cache is tracked in terms of local and cluster cache, and storage quota is used to support the cache statistics. The Clear counters button at the bottom of the Cache Server Statistics panel is used to clear the cache statistics values.
The following table provides descriptions to the key components of the Cluster Hit Rates panel.
| Key | Description |
|---|---|
| Local Cache Hits (this appliance) | The percentage of times a request was made and the required data was found in the local cache. |
| Cluster Cache Hits (peer appliances) | The percentage of times a request was made and the required data was found in another application server cache in the cluster. |
| Email Backend Hits (email servers) | The percentage of times a request was made and the required data was found in the email servers. |
| Total read attempts | The total number of times a cache was attempted to be read. The attempt may have failed if there was a value in the Failed writes field, reported locally and cluster-wide. |
| Failed writes | The total number of times a cache was read but failed, reported locally and cluster-wide. |