The system tracks cache server statistics by cluster hit rates and storage usage. Hits represent the data required for the transaction that the system finds in the cache. The system tracks this data in terms of local counts and cluster-wide counts of voice mail messages.
Local cache is the cache on the application server that you are viewing.
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 system tracks the cache in terms of local and cluster cache. The system uses the storage quota to support the cache statistics. Use the Clear counters button in the Counters panel 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 the system made a request and found the required data in the local cache. |
| Cluster Cache Hits (peer appliances) | The percentage of times the system made a request and found the required data in another application server cache in the cluster. |
| Email Backend Hits (email servers) | The percentage of times the system made a request and found the required data in the email servers. |
| Total read attempts | The total number of times the system attempted to read a cache.
The attempt might fail if there is a value in the Failed writes field. |
| Failed writes | The total number of times the system attempted to read a cache but failed. |