Quick Reference: AIX Logical Volume Manager and Veritas Volume Manager

An IBM Redpaper publication

Note: This is publication is now archived. For reference only.

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Published on December 19, 2000

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IBM Form #: REDP-0107-00


Authors: Scott Vetter and Johnny Shieh

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    Abstract

    In the world of UNIX storage management, there are two primary leaders: IBM

    and Veritas. Both companies offer products that help UNIX system administrators

    manage storage in very flexible methods in comparison to older UNIX

    implementations. IBM offers the Logical Volume Manager (LVM) as part of its

    Advanced Interactive Executive (AIX) operating system. The LVM is built into the

    base operating system and is provided as part of the base AIX installation. Veritas

    offers the Veritas Volume Manager (VxVM) which is either packaged as a

    standalone add-on or part of a larger package such as the Veritas On-Line Storage

    Manager. VxVM is designed to be an additional software package added to a

    UNIX operating system, most notably the Solaris operating system by Sun

    Microsystems, Inc.

    Table of Contents

    Introduction

    Terminology

    Limitations

    Volume Groups

    Physical Volumes in Volume Groups

    Physical Partitions per Volume Group

    Logical Volumes per Volume Group

    Logical Partitions per Logical Volume

    Mirrored Copies of a Logical Volume

    Functional Differences

    Software RAID Levels

    Mirrored Read Policy

    Hot Spot Management

    Read/Write Resynchronization

    Online Backup of File Systems

    Snapshot Backup of File Systems

    Quick Resynchronization of Changed Partitions After Backup .

    Migration of Data with Active Volumes

    Transparent Data Stream Switch After Mirrored Disks Fail

    Operation in a Multinode Concurrent Configuration

    Commands to Replace Dead or Failing Drives

    Hot Spare, Standby Disks

    Commands

    Special Notices

     

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