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HP-UX System Administrator's Guide: Logical Volume Management: HP-UX 11i Version 3
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HP Part Number: 5992-6576

Edition: 4

Published: September 2009

© Copyright 2009 Hewlett-Packard Development Company, L.P.

Table of Contents

About This Document
Intended Audience
New and Changed Information in This Edition
About this Series
Document Organization
Typographic Conventions
Examples and Shells
Command Syntax
Related Information
Finding HP-UX Information
HP-UX 11i Release Names and Operating System Version Identifiers
Determining Your System Version
Publication History
HP Encourages Your Comments
1 Introduction
LVM Features
LVM Architecture
Physical versus Logical Extents
LVM Volume Group Versions
LVM Device File Usage
Legacy Device Files versus Persistent Device Files
Naming Conventions for LVM
Device Number Format
LVM Disk Layout
Boot Data Reserved Area
Logical Interface Format Area
Physical Volume Reserved Area
Volume Group Reserved Area
User Data Area
LVM Limitations
Shared LVM
2 Configuring LVM
Planning Your LVM Configuration
Setting Up Different Types of Logical Volumes
Setting Up Logical Volumes for Raw Data Storage
Setting Up Logical Volumes for File Systems
Setting Up Logical Volumes for Swap
Setting Up Logical Volumes for Dump
Planning for Availability
Increasing Data Availability Through Mirroring
Increasing Disk Redundancy Through Disk Sparing
Increasing Hardware Path Redundancy Through Multipathing
Planning for Performance
General Performance Factors
Internal Performance Factors
Increasing Performance Through Disk Striping
Increasing Performance Through I/O Channel Separation
Planning for Recovery
Preparing for LVM System Recovery
3 Administering LVM
Administration Tools
Displaying LVM Information
Information on Volume Groups
Information on Physical Volumes
Information on Logical Volumes
Common LVM Tasks
Initializing a Disk for LVM Use
Creating a Volume Group
Migrating a Volume Group to a Different Version: vgversion
Adding a Disk to a Volume Group
Removing a Disk from a Volume Group
Creating a Logical Volume
Extending a Logical Volume
Reducing a Logical Volume
Adding a Mirror to a Logical Volume
Removing a Mirror from a Logical Volume
Renaming a Logical Volume
Removing a Logical Volume
Exporting a Volume Group
Importing a Volume Group
Modifying Volume Group Parameters
Quiescing and Resuming a Volume Group
Renaming a Volume Group
Splitting a Volume Group
Removing a Volume Group
Backing Up a Mirrored Logical Volume
Backing Up and Restoring Volume Group Configuration
Moving and Reconfiguring Your Disks
Moving Disks Within a System
Moving Disks Between Systems
Moving Data to a Different Physical Volume
Moving Data for Disk Space Balancing: Auto Re-balancing
Creating a Spare Disk
Reinstating a Spare Disk
Modifying Physical Volume Characteristics
Disabling a Path to a Physical Volume
Creating an Alternate Boot Disk
Mirroring the Boot Disk
Migrating a Volume Group to New Disks: vgmove
Example of Migrating a Volume Group to New Disks
Administering File System Logical Volumes
Creating a File System
Extending a File System
Reducing the Size of a File System
Backing Up a VxFS Snapshot File System
Administering Swap Logical Volumes
Creating a Swap Logical Volume
Extending a Swap Device
Reducing the Size of a Swap Device
Administering Dump Logical Volumes
Creating a Dump Logical Volume
Removing a Dump Logical Volume
Hardware Issues
Integrating Cloned LUNs
4 Troubleshooting LVM
Troubleshooting Tools Overview
Information Collection
Consistency Checks
Maintenance Mode Boot
Log Files and Trace Files
I/O Errors
Recoverable Errors
Nonrecoverable Errors
Volume Group Activation Failures
Quorum Problems with a Nonroot Volume Group
Quorum Problems with a Root Volume Group
Version 2.x Volume Group Activation Failures
Root Volume Group Scanning
LVM Boot Failures
Insufficient Quorum
Corrupted LVM Data Structures on Disk
Corrupted LVM Configuration File
Problems After Reducing the Size of a Logical Volume
Replacing a Bad Disk
Disk Replacement Prerequisites
Replacing a Mirrored Nonboot Disk
Replacing an Unmirrored Nonboot Disk
Replacing a Mirrored Boot Disk
Replacing an Unmirrored Boot Disk
Warning and Error Messages
Matching Error Messages to Physical Disks and Volume Groups
Messages For All LVM Commands
lvchange(1M)
lvextend(1M)
lvlnboot(1M)
pvchange(1M)
vgcfgbackup(1M)
vgcfgrestore(1M)
vgchange(1M)
vgcreate(1M)
vgdisplay(1M)
vgextend(1M)
vgimport(1M)
vgversion(1M)
/var/adm/syslog/syslog.log
Reporting Problems
A LVM Specifications and Limitations
B LVM Command Summary
C Volume Group Provisioning Tips
Choosing an Optimal Extent Size for a Version 1.0 Volume Group
Glossary
Index

List of Figures

1-1 Disk Space Partitioned Into Logical Volumes
1-2 Physical Extents and Logical Extents
2-1 File System Space Components
2-2 Interleaving Disks Among Buses
3-1 Sample LVM Disk Layout on an HP Integrity Server

List of Tables

1 Finding HP-UX Information
2 HP-UX 11i Releases
3 OS Version, System Architecture, and Machine Model
1-1 LVM Volume Group Version Properties
1-2 Physical Volume Naming Conventions
1-3 Version 1.0 Device Number Format
1-4 Version 2.x Device Number Format
3-1 Physical Volume Management Commands
3-2 Volume Group Management Commands
3-3 Logical Volume Management Commands
3-4 Supported Volume Group Version Migrations
3-5 Supported LUN Changes Per Release
4-1 LVM Information to Collect and Maintain
A-1 Volume Group Version Maximums
A-2 Version 1.0 Volume Group Limits
A-3 Version 2.x Volume Group Limits
B-1 LVM Command Summary
   


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© 2009 Hewlett-Packard Development Company, L.P.