3PAR System Reporter User’s Guide

System Reporter 2.8

and tier 2 is the slowest. Tiers are defined by Common Provisioning Groups (CPGs) and all of the cost and performance characteristics of the tier are determined by the setting of the CPG, such as the RAID level, number of disks used, disk type and speed. You can also control the maximum space available for each tier. See section 9.3.1 Tier Definition (CPG Name and GiB) on page 9.6 for more details.

In addition to the space available for the tiers, you can also differentiate configurations by an Adaptive Optimization mode described in 9.3.4 Adaptive Optimization Mode on page 9.10.

You must also specify the schedule (the dates, weekdays and hours) when the configuration will execute (see 9.3.2 Schedule on page 9.9) as well as the number of hours of data prior to the execution time that the analysis should consider for optimization purposes (see 9.3.3 Measurement Hours on page 9.9).

The analysis for an Adaptive Optimization configuration first calculates the space available in each CPG (tier). It then calculates the access rate (IO accesses/(GiB * minute)) over the measurement interval (specified in the configuration) for all the VV regions in the CPGs for a configuration as well as the average access rates for each CPG (tier). Based on the space available in each tier, and the performance of each region in comparison with the averages for each of the tiers, the data is moved from one tier to the other as applicable using a CLI program (mvrg).

NOTE: Adaptive Optimization analyzes each configuration independent of the other configurations. Only the space available in each tier of the configuration and the relative access rates of the regions in the tiers (CPGs) of the configuration matter. Of course, there may be indirect influences from other configurations. For example, if CPGs from two configuration use the same PDs, then space used by a CPG in one configuration may cause less space to be available for the CPG in the other configuration.

System Reporter can generate a number of different reports that you can use to track storage utilization and monitor the movement of data performed by Adaptive Optimization. See 5.3 Creating Custom Reports on page 5.4 for details on generating reports.

9.2 Overview