Hp 3Par System Tuner Software - HP 3PAR StoreServ 7200 2-node Manual

There are several ways Dynamic Optimization may improve system performance:
Volume layout changes after hardware upgrades. Existing virtual volumes only take advantage
of resources that were present at the time of volume creation. When a system is upgraded by
adding nodes, cages, or disks, the original volume and logical disk layouts may no longer
be optimal. Changing the layout of a virtual volume enables volumes to take full advantage
of new system resources.
By default, Thinly-Provisioned Virtual Volumes (TPVVs) and their underlying Common
Provisioning Groups (CPGs) dedicate space from all available resources as they grow, both
from pre-existing and new drive capacity resources. This natural expansion capability of TPVVs
reduces the need for Dynamic Optimization to change the layout of TPVVs after adding disks.
Volume RAID level changes. Since different RAID levels have varying capacity requirements
and offer different degrees of performance, you may desire to convert volumes from one RAID
type to another when system requirements change.
Volume fault-tolerance changes. A volume with a cage-level availability can tolerate the failure
of a drive cage because its RAID sets use chunklets from different drive cages. A volume with
a magazine-level availability can tolerate the failure of a drive magazine because its RAID
sets use chunklets from different magazines. As applications and business requirements change,
it may be desirable to update the fault-tolerance characteristics of existing virtual volumes.
CPG and volume growth configuration changes. Changing the characteristics of CPGs and
changing virtual volume growth patterns can also reduce system performance over time. Tuning
optimizes the system layout by balancing the use of all available resources.
With dynamic optimization, you can manually change specific parameters on any specified virtual
volumes. This feature also analyzes your entire system and automatically corrects space usage
imbalances in the system. Virtual volume and physical disk capacity are analyzed and rebalanced
for optimal performance. The dynamic optimization automated tuning process has three phases:
1. Analyze the system and detect virtual volumes which are not correctly balanced between
nodes. If virtual volumes are not balanced correctly, the volumes are tuned to correct the
imbalance. This is the internode tuning phase.
2. Analyze the system and detect any chunklet imbalance between physical discs associated
with the same node. After the analysis, chunklets are moved from overused physical discs to
under used physical discs associated with the same node. This is the intranode tuning phase.
3. Analyze the system and verify that logical disks associated with a CPG have the same
characteristics as the CPG. If the logical disk characteristics do not match the CPG, the logical
disk is modified to match the CPG characteristics.
Dynamic Optimization tasks can be performed with both the HP 3PAR Command Line Interface
and the HP 3PAR Management Console. Refer to the HP 3PAR Command Line Interface
Administrator's Manual and the HP 3PAR Management Console Online Help for instructions on
how to perform these tasks

HP 3PAR System Tuner Software

HP 3PAR System Tuner Software is an optional feature that improves performance by identifying
over-used physical disks, and performing load balancing on those disks without interrupting access.
You must purchase the HP 3PAR System Tuner license to use this feature.
The HP 3PAR OS automatically creates a balanced system layout by mapping virtual volumes to
many logical disks, and creating logical disks from chunklets drawn from many physical disks. The
I/O for each volume is striped across many physical disks, increasing the throughput of the volume.
As the system grows and new applications are introduced, new storage usage patterns can emerge
and the system performance can degrade. System Tuner maintains peak system performance by
automatically detecting and resolving bottlenecks without interrupting access.
54 Enhanced Storage Applications