Installation guide
Table Of Contents
- LVM Administrator's Guide
- Table of Contents
- Introduction
- Chapter 1. The LVM Logical Volume Manager
- Chapter 2. LVM Components
- Chapter 3. LVM Administration Overview
- Chapter 4. LVM Administration with CLI Commands
- 1. Using CLI Commands
- 2. Physical Volume Administration
- 3. Volume Group Administration
- 3.1. Creating Volume Groups
- 3.2. Adding Physical Volumes to a Volume Group
- 3.3. Displaying Volume Groups
- 3.4. Scanning Disks for Volume Groups to Build the Cache File
- 3.5. Removing Physical Volumes from a Volume Group
- 3.6. Changing the Parameters of a Volume Group
- 3.7. Activating and Deactivating Volume Groups
- 3.8. Removing Volume Groups
- 3.9. Splitting a Volume Group
- 3.10. Combining Volume Groups
- 3.11. Backing Up Volume Group Metadata
- 3.12. Renaming a Volume Group
- 3.13. Moving a Volume Group to Another System
- 3.14. Recreating a Volume Group Directory
- 4. Logical Volume Administration
- 4.1. Creating Logical Volumes
- 4.2. Persistent Device Numbers
- 4.3. Resizing Logical Volumes
- 4.4. Changing the Parameters of a Logical Volume Group
- 4.5. Renaming Logical Volumes
- 4.6. Removing Logical Volumes
- 4.7. Displaying Logical Volumes
- 4.8. Growing Logical Volumes
- 4.9. Extending a Striped Volume
- 4.10. Shrinking Logical Volumes
- 5. Creating Snapshot Volumes
- 6. Controlling LVM Device Scans with Filters
- 7. Online Data Relocation
- 8. Activating Logical Volumes on Individual Nodes in a Cluster
- 9. Customized Reporting for LVM
- Chapter 5. LVM Configuration Examples
- Chapter 6. LVM Troubleshooting
- Chapter 7. LVM Administration with the LVM GUI
- Appendix A. The Device Mapper
- Appendix B. The LVM Configuration Files
- Appendix C. LVM Object Tags
- Appendix D. LVM Volume Group Metadata
- Index
filter = [ "a|^/dev/hda8$|", "r/.*/" ]
For more information on the lvm.conf file, see Appendix B, The LVM Configuration Files and the
lvm.conf(5) man page.
7. Online Data Relocation
You can move data while the system is in use with the pvmove command.
The pvmove command breaks up the data to be moved into sections and creates a temporary
mirror to move each section. For more information on the operation of the pvmove command, see
the pvmove(8) man page.
Because the pvmove command uses mirroring, it is not cluster-aware and needs exclusive ac-
cess to a volume. For information on activating logical volumes on individual nodes in a cluster,
see Section 8, “Activating Logical Volumes on Individual Nodes in a Cluster”.
The following command moves all allocated space off the physical volume /dev/sdc1 to other
free physical volumes in the volume group:
pvmove /dev/sdc1
The following command moves just the extents of the logical volume MyLV.
pvmove -n MyLV /dev/sdc1
Since the pvmove command can take a long time to execute, you may want to run the command
in the background to avoid display of progress updates in the foreground. The following com-
mand moves all extents allocated to to the physical volume /dev/sdc1 over to /dev/sdf1 in the
background.
pvmove -b /dev/sdc1 /dev/sdf1
The following command reports the progress of the move as a percentage at five second inter-
vals.
pvmove -i5 /dev/sdd1
8. Activating Logical Volumes on Individual
Nodes in a Cluster
If you have LVM installed in a cluster environment, you may at times need to activate logical
volumes exclusively on one node. For example, the pvmove command is not cluster-aware and
needs exclusive access to a volume. LVM snapshots require exclusive access to a volume as
well.
7. Online Data Relocation
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