HP 3PAR Operating System Software - Manual (Page 187)

13 Managing AO Configurations
Adaptive Optimization (AO) analyzes sub-volume, region level disk access rates for a given array
over a scheduled period of time and performs a data migration of regions between tiers according
to a cost versus performance preference. Disk utilization is optimized by having frequently accessed
data moved to the higher performance tier (for example, RAID 1 on SSDs) while infrequently
accessed data is moved to the lower cost tier (for example, RAID 6 on Nearline disks). Multiple
Adaptive Optimization configurations can be defined for an HP 3PAR StoreServ Storage array.
For each AO configuration, you can assign either two or three storage tiers (numbered 0, 1, and
2) for data migration, where tier 0 is the fastest, tier 1 is the intermediate speed, and tier 2 is the
slowest. Tiers are defined by CPGs, and all of the cost and performance characteristics of the tier
are determined by the CPG, settings, such as the RAID level, number of disks used, disk type, and
speed.
The analysis for an AO 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 arguments to the startao command for all the virtual volume regions in a configuration’s CPGs,
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.
NOTE: AO analyzes each configuration independently of any other configurations. Only the
space available in each tier of the specified configuration and the relative access rates of the
regions in the tiers are included in the analysis. However, there might be indirect influences from
other configurations. For example, if CPGs from two configuration use the same physical disks,
then space used by a CPG in one configuration might cause less space to be available for the
CPG in the other configuration.
For storage systems that support the adaptive optimization feature, an AO Configurations node
appears in the Management Tree for both the Storage Systems and Domains tree nodes.
NOTE: An AO license is required to perform tuning and optimization. If no AO license is present
on the array, only an analysis of potential optimization can be performed.
The AO Configuration wizard is available through the Provisioning Manager. It allows you to
create, edit, delete, start, and schedule AO configurations. For more information see the following
sections:
“Creating an AO Configuration” (page 187)
“Editing an AO Configuration” (page 190)
“Deleting an AO Configuration” (page 190)
“Starting an AO Configuration” (page 190)
“Removing a Tier CPG from an AO Configuration” (page 190)
“Viewing an AO Configuration” (page 190)
“Creating an AO Configurations Report” (page 362)
Creating an AO Configuration
To create an AO Configuration:
1.
While in the Provisioning Manager, expand the arrow next to the name of the system on which
you want to create the configuration.
Creating an AO Configuration 187