LVM Administrator's Guide
Configuration andAdministration
5.2
Cluster_Logical_Volume_ManagerISBN: N/A
Publication date: May 2008
This book describes the LVM logical volume manager for Red Hat Enterprise Linux 5.2,including information on running LVM in a clustered environment. The content of this documentis specific to the LVM2 release.
LVM Administrator's Guide
LVM Administrator's Guide: Configuration and AdministrationCopyright 2008 Red Hat, Inc.
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LVM Administrator's Guide
Introduction ............................................................................................................... ix1. About This Guide ........................................................................................... ix2. Audience ....................................................................................................... ix3. Software Versions .......................................................................................... ix4. Related Documentation .................................................................................. ix5. Feedback .......................................................................................................x6. Document Conventions ...................................................................................x
1. The LVM Logical Volume Manager .......................................................................... 11. Logical Volumes ............................................................................................ 12. LVM Architecture Overview ............................................................................ 23. Running LVM in a Cluster ............................................................................... 34. Document Overview ....................................................................................... 5
2. LVM Components .................................................................................................. 71. Physical Volumes ........................................................................................... 7
1.1. LVM Physical Volume Layout ............................................................... 71.2. Multiple Partitions on a Disk ................................................................. 8
2. Volume Groups .............................................................................................. 93. LVM Logical Volumes ..................................................................................... 9
3.1. Linear Volumes ................................................................................... 93.2. Striped Logical Volumes .....................................................................123.3. Mirrored Logical Volumes ...................................................................133.4. Snapshot Volumes .............................................................................15
3. LVM Administration Overview ................................................................................171. Creating LVM Volumes in a Cluster ................................................................172. Logical Volume Creation Overview .................................................................173. Growing a File System on a Logical Volume ...................................................184. Logical Volume Backup .................................................................................185. Logging ........................................................................................................18
4. LVM Administration with CLI Commands ................................................................211. Using CLI Commands ...................................................................................212. Physical Volume Administration .....................................................................22
2.1. Creating Physical Volumes .................................................................232.2. Displaying Physical Volumes ..............................................................242.3. Preventing Allocation on a Physical Volume .........................................252.4. Resizing a Physical Volume ................................................................252.5. Removing Physical Volumes ...............................................................25
3. Volume Group Administration ........................................................................263.1. Creating Volume Groups ....................................................................263.2. Adding Physical Volumes to a Volume Group .......................................273.3. Displaying Volume Groups ..................................................................273.4. Scanning Disks for Volume Groups to Build the Cache File ...................283.5. Removing Physical Volumes from a Volume Group ..............................293.6. Changing the Parameters of a Volume Group ......................................293.7. Activating and Deactivating Volume Groups .........................................303.8. Removing Volume Groups ..................................................................303.9. Splitting a Volume Group ....................................................................30
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3.10. Combining Volume Groups ...............................................................313.11. Backing Up Volume Group Metadata .................................................313.12. Renaming a Volume Group ...............................................................313.13. Moving a Volume Group to Another System .......................................313.14. Recreating a Volume Group Directory ................................................32
4. Logical Volume Administration .......................................................................324.1. Creating Logical Volumes ...................................................................334.2. Persistent Device Numbers .................................................................374.3. Resizing Logical Volumes ...................................................................384.4. Changing the Parameters of a Logical Volume Group ...........................384.5. Renaming Logical Volumes .................................................................384.6. Removing Logical Volumes .................................................................394.7. Displaying Logical Volumes ................................................................394.8. Growing Logical Volumes ...................................................................404.9. Extending a Striped Volume ................................................................414.10. Shrinking Logical Volumes ................................................................42
5. Creating Snapshot Volumes ..........................................................................436. Controlling LVM Device Scans with Filters ......................................................447. Online Data Relocation ..................................................................................458. Activating Logical Volumes on Individual Nodes in a Cluster ............................469. Customized Reporting for LVM ......................................................................46
9.1. Format Control ...................................................................................479.2. Object Selection .................................................................................499.3. Sorting LVM Reports ..........................................................................569.4. Specifying Units .................................................................................57
5. LVM Configuration Examples .................................................................................591. Creating an LVM Logical Volume on Three Disks ............................................59
1.1. Creating the Physical Volumes ............................................................591.2. Creating the Volume Group .................................................................591.3. Creating the Logical Volume ...............................................................591.4. Creating the File System .....................................................................60
2. Creating a Striped Logical Volume .................................................................602.1. Creating the Physical Volumes ............................................................602.2. Creating the Volume Group .......................................
