The History panel enables you to save older data for a monitored property. For example, a history of data points could be recorded every 120 seconds, as specified in the Sample Interval field. You can store this information in one of two places:
Disk file
There are two types of disk files: circular and text. These files are located in the /var/opt/SUNWsymon/log directory.
Memory cache
If you store information in the memory cache, you must also indicate how many data points should be saved in the Max Size (sample) field.
You can view the history data in a graph by opening the graph for the selected monitored property. If you have selected memory cache, the graph is displayed with the historical data.