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

InForm OS Version 2.2.4 3PAR InForm OS Concepts Guide

7.1

Logical Disks

In this chapter

7.1 Logical Disks and Virtual Volumes 7.1

7.2 Logical Disks and Common Provisioning Groups 7.2

7.3 Logical Disk Types 7.2

7.4 Logical Disk Size and RAID Type 7.3

7.5 Logical Disks and Physical Disks 7.4

7.1 Logical Disks and Virtual Volumes

Virtual volumes are built on logical disks, which are built on physical disks. A logical disk is a

collection of physical disk chunklets that have been arranged as rows of RAID sets. Volumes are

created by mapping data from one or more logical disks, where mapping is the

correspondence of logical disk regions to virtual volume regions.

You can either create a virtual volume where the system automatically creates the volume’s

underlying logical disks, or create a virtual volume which draws its logical disks from a common

provisioning group (see Logical Disks and Common Provisioning Groups on page 7.2). For

instructions on creating virtual volumes, see the InForm OS CLI Administrator’s Manual or the

InForm OS Management Console Online Help.