Description:
We often refer to live and historical metrics, but when does SmartStor metric data status change from live to historical?
Solution:
Metric data is considered to be live when it resides in the EM internal compressed memory cache.
Prior to 9.5, the cache size for the number of metric data points/timeslices was fixed at 32.
Therefore, any new data remains live for 8 minutes (32 x 15sec time slices) before becoming historical.
In 9.5 the memory cache can be configured to be larger by increasing the value of this property and restarting the EM:
introscope.enterprisemanager.memoryCache.elements
For further details please see the APM 9.5 Configuration & Administration Guide.