VERITAS Volume Manager 4.1 Migration Guide

Chapter 1 1
1 VxVM and LVM
Summary
This chapter provides an overview of the VERITAS Volume Manager (also referred to as
VxVM) and its features. A brief description of the benefits of migrating from the HP-UX
Logical Volume Manager (LVM) to VxVM, and the coexistence of VxVM disks with LVM disks
is also given.
The following topics are discussed in this chapter:
• Introducing the VERITAS Volume Manager
• VxVM and LVM-Conceptual Comparison
• Coexistence of VxVM and LVM Disks
Introducing the VERITAS Volume Manager
The VERITAS Volume Manager is an alternative Volume Management product for HP-UX
that includes mirroring features. It offers many capabilities that are not available with the
LVM and MirrorDisk/UX products today.
• The VERITAS Volume Manager can coexist with LVM. Users can decide which volumes
they want managed by each volume manager. For users who want to migrate LVM volume
groups to VxVM disk groups, a conversion utility is included. This utility, vxvmconvert, is
described in detail in Converting LVM to VxVM.
• With HP-UX 11i Version 2, the VERITAS Volume Manager is available for installation
with the HP-UX 11i Version 2 Application Software. See VERITAS Volume Manager
Release Notes for details of features supported in this release.
• With HP-UX 11i Version 2, the VERITAS Volume Manager is the default volume manager
and can be used instead of LVM to manage the root disk. Basic volume management
capabilities are included in the operating system.