3PAR InForm® OS 2.2.4 Concepts Guide (320-200085 Rev B, March 2009)

8.3
About the Admin Volume
InForm OS Version 2.2.4 3PAR InForm OS Concepts Guide
the CPG require additional storage, the system automatically creates additional logical disks
and adds them to the pool until the CPG reaches the user-defined growth limit that restricts
the CPG’s maximum size.
Before creating a TPVV, you must first create a CPG. For instructions on creating CPGs and
TPVVs, see the InForm OS CLI Administrator’s Manual or the InForm OS Management Console
Online Help.
8.4 About the Admin Volume
As part of installation and setup, a base volume called the admin volume (or administrative
volume), is created on the system. This volume is used by the system to store administrative
data such as the system event log and is always named admin. This volume cannot be
exported and cannot be removed from the system. It is strongly recommended that you not
tamper with this volume.
8.5 System Guidelines for Volume Creation
When opting to specify advanced parameters for logical disk creation, use the following
guidelines to ensure maximum performance and optimal reliability in the volumes supported
by those logical disks:
■ Chunklets in the same RAID set should be from different drive magazines or drive cages.
■ Chunklets in the same row should be from different physical disks. In other words, a
physical disk should not appear twice in the same row.
■ Chunklets should belong to a disk that is connected through the primary path to the logical
disk’s owner node.
■ The system should use as many physical disks as possible.
■ The load on all physical disks should be balanced.
■ The system should use the largest possible row size.