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Red Hat Enterprise Linux 6
Logical Volume Manager
Administration
LVM Administrator Guide
Edition 1
Red Hat Enterprise Linux 6 Logical Volume Manager Administration
LVM Administrator Guide
Edition 1
Legal Notice
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Abstract
T his book describes the LVM logical volume manager, including information on running LVM in a
clustered environment.
Table of Contents
Table of Contents
Introduction
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
. . . . . . . . . .
1. About T his Guide
6
2. Audience
6
3. Software Versions
6
4. Related Documentation
6
5. We Need Feedback!
7
6. Document Conventions
7
6.1. T ypographic Conventions
7
6.2. Pull-quote Conventions
8
6.3. Notes and Warnings
9
Chapter 1.
. . .
LVM
. . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .
T he
. . . . . .
Logical
.
Volume
.
Manager
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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1.1. New and Changed Features
10
1.1.1. New and Changed Features for Red Hat Enterprise Linux 6.0
10
1.1.2. New and Changed Features for Red Hat Enterprise Linux 6.1
10
1.1.3. New and Changed Features for Red Hat Enterprise Linux 6.2
11
1.1.4. New and Changed Features for Red Hat Enterprise Linux 6.3
11
1.1.5. New and Changed Features for Red Hat Enterprise Linux 6.4
11
1.1.6. New and Changed Features for Red Hat Enterprise Linux 6.5
12
1.2. Logical Volumes
12
1.3. LVM Architecture Overview
13
1.4. T he Clustered Logical Volume Manager (CLVM)
14
1.5. Document Overview
16
Chapter 2.
. . . . . . . . . . . . . . . .
. . . . . . . . . . . .
LVM
.
Components
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
2.1. Physical Volumes
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2.1.1. LVM Physical Volume Layout
17
2.1.2. Multiple Partitions on a Disk
18
2.2. Volume Groups
18
2.3. LVM Logical Volumes
18
2.3.1. Linear Volumes
18
2.3.2. Striped Logical Volumes
20
2.3.3. Mirrored Logical Volumes
21
2.3.4. RAID Logical Volumes
22
2.3.5. T hinly-Provisioned Logical Volumes (T hin Volumes)
22
2.3.6. Snapshot Volumes
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2.3.7. T hinly-Provisioned Snapshot Volumes
24
Chapter 3.
. . . .
Administration
. . . . . . . . .
. . . . . . . . . . . .
LVM
. . . . . . . . . . . . . . . .
Overview
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25
3.1. Creating LVM Volumes in a Cluster
25
3.2. Logical Volume Creation Overview
25
3.3. Growing a File System on a Logical Volume
26
3.4. Logical Volume Backup
26
3.5. Logging
26
3.6. T he Metadata Daemon (lvmetad)
27
Chapter 4
. . . . . . . . . . . . . . . . . .
with
. . . . . . . . . . . . . .
. . . . . . . . . . .
.
.
LVM
.
Administration
. . . . . .
CLI
.
Commands
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28
4.1. Using CLI Commands
28
4.2. Physical Volume Administration
29
4.2.1. Creating Physical Volumes
29
4.2.1.1. Setting the Partition T ype
29
4.2.1.2. Initializing Physical Volumes
29
4.2.1.3. Scanning for Block Devices
30
1
Red Hat Enterprise Linux 6 Logical Volume Manager Administration
4.2.2. Displaying Physical Volumes
4.2.3. Preventing Allocation on a Physical Volume
4.2.4. Resizing a Physical Volume
4.2.5. Removing Physical Volumes
4.3. Volume Group Administration
4.3.1. Creating Volume Groups
4.3.2. LVM Allocation
4.3.3. Creating Volume Groups in a Cluster
4.3.4. Adding Physical Volumes to a Volume Group
4.3.5. Displaying Volume Groups
4.3.6. Scanning Disks for Volume Groups to Build the Cache File
4.3.7. Removing Physical Volumes from a Volume Group
4.3.8. Changing the Parameters of a Volume Group
4.3.9. Activating and Deactivating Volume Groups
4.3.10. Removing Volume Groups
4.3.11. Splitting a Volume Group
4.3.12. Combining Volume Groups
4.3.13. Backing Up Volume Group Metadata
4.3.14. Renaming a Volume Group
4.3.15. Moving a Volume Group to Another System
4.3.16. Recreating a Volume Group Directory
4.4. Logical Volume Administration
4.4.1. Creating Linear Logical Volumes
4.4.2. Creating Striped Volumes
4.4.3. Creating Mirrored Volumes
4.4.3.1. Mirrored Logical Volume Failure Policy
4.4.3.2. Splitting Off a Redundant Image of a Mirrored Logical Volume
4.4.3.3. Repairing a Mirrored Logical Device
4.4.3.4. Changing Mirrored Volume Configuration
4.4.4. Creating T hinly-Provisioned Logical Volumes
4.4.5. Creating Snapshot Volumes
4.4.6. Creating T hinly-Provisioned Snapshot Volumes
4.4.7. Merging Snapshot Volumes
4.4.8. Persistent Device Numbers
4.4.9. Resizing Logical Volumes
4.4.10. Changing the Parameters of a Logical Volume Group
4.4.11. Renaming Logical Volumes
4.4.12. Removing Logical Volumes
4.4.13. Displaying Logical Volumes
4.4.14. Growing Logical Volumes
4.4.14.1. Extending a Striped Volume
4.4.14.2. Extending a Mirrored Volume
4.4.14.3. Extending a Logical Volume with the cling Allocation Policy
4.4.15. RAID Logical Volumes
4.4.15.1. Creating a RAID Logical Volume
4.4.15.2. Converting a Linear Device to a RAID Device
4.4.15.3. Converting an LVM RAID1 Logical Volume to an LVM Linear Logical Volume
4.4.15.4. Converting a Mirrored LVM Device to a RAID1 Device
4.4.15.5. Changing the Number of Images in an Existing RAID1 Device
4.4.15.6. Splitting off a RAID Image as a Separate Logical Volume
4.4.15.7. Splitting and Merging a RAID Image
4.4.15.8. Setting a RAID fault policy
4.4.15.8.1. T he allocate RAID Fault Policy
4.4.15.8.2. T he warn RAID Fault Policy
4.4.15.9. Replacing a RAID device
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