The workload analysis period should match your business cycle. For most organizations, one week represents a complete business cycle.
By default, Optimizer uses a 10-minute interval between data collections. This interval was proved to be a reasonable option taking into account the overhead on the Symmetrix system and the overhead of processing too many data samples on the service processor with the Optimizer engine. If you choose a longer workload analysis period (say, three weeks) Optimizer will change the data collection interval to 30 minutes. This might affect the quality of analysis because short bursts of activity and correlation between volumes might be missed due to the longer collection period.
Optimizer runs the analysis process only if there is good enough coverage of the analysis period. (The oldest sample is older than the initial period, and the database contains more than 50 percent of the expected time samples.)
Setting Workload Analysis Period and Initial Period from SMC
The Parameter tab of the Optimizer dialog box provides both status information and configuration capabilities for Optimizer. To change parameters, and have them recognized by the service processor, follow these steps:
In the Workload Analysis Settings field, enter the new parameters for the Workload Analysis Period,
or enter new parameters for the Initial Period.
Figure 11. Setting new Workload Analysis Settings
EMC Symmetrix Optimizer A Detailed Review