The alarm cache application was developed to essentially cache all the vital information about active alarms in the SNMP Manager which haven't cleared, namely their carrier, cluster and section information.

This functionality was used for the EMS 3.1 release which includes indoor mapping and section colouring for indoor venues (such as AT&T Stadium). Before alarm cache was implemented the EMS Cache handled all caching of data, this included everything present in the SNMP Manager DB and hence was heavily tied to the current domain structure and meant scalability and maintainability was an issue going forward.

Since the alarm cache contains the vital data on alarms, we can query its DB on a cluster, carrier or section level returning alarms instantly to the EMS