We often refer to live and historical metrics, but when does SmartStor metric data status change from live to historical?
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:
For further details please see the APM 9.5 Configuration & Administration Guide.