VERITAS Volume Manager 3.1 Administrator's Guide

Volume Tasks
Introduction
Chapter 6234
Introduction
This chapter describes how to create and maintain a system
configuration under Volume Manager control. It includes information
about creating, removing, and maintaining Volume Manager objects.
Volume Manager objects include:
• Volumes
Volumes are logical device that appear to data management systems
as physical disk partition devices. Volumes provide enhanced
recovery, data availability, performance, and storage configuration
options. Volume tasks are used to protect data in the event of device
failures.
• Plexes
Plexes are logical groupings of subdisks that create an area of disk
space independent of physical disk size or other restrictions.
Replication (mirroring) of disk data is done by creating multiple
plexes for a single volume. Each plex contains an identical copy of the
volume data. Because each plex must reside on different disks, the
replication provided by mirroring prevents data loss in the event of a
single-point disk-subsystem failure. Multiple plexes also provide
increased data integrity and reliability.
• Subdisks
Subdisks are low-level building blocks in a Volume Manager
configuration.
Volume, Plex, and Subdisk Tasks
This chapter provides information on the following tasks:
Volume Tasks
• “Creating a Volume”
• “Starting a Volume”
• “Stopping a Volume”
• “Resizing a Volume”