Red Hat ENTERPRISE LINUX 5 - LOGICAL VOLUME MANAGER ADMINISTRATION Guide d'installation Page 37
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When the system is next shut down, you can unplug the disks that constitute the volume
group and connect them to the new system.
4. When the disks are plugged into the new system, use the vgimport command to import the
volume group, making it accessible to the new system.
5. Activate the volume group with the -a y argument of the vgchange command.
6. Mount the file system to make it available for use.
3.14. Recreating a Volume Group Directory
To recreate a volume group directory and logical volume special files, use the vgmknodes com-
mand. This command checks the LVM2 special files in the /dev directory that are needed for
active logical volumes. It creates any special files that are missing removes unused ones.
You can incorporate the vgmknodes command into the vgscan command by specifying the -
-mknodes argument to the command.
4. Logical Volume Administration
This section describes the commands that perform the various aspects of logical volume admin-
istration.
4.1. Creating Logical Volumes
To create a logical volume, use the lvcreate command. You can create linear volumes, striped
volumes, and mirrored volumes, as described in the following subsections.
If you do not specify a name for the logical volume, the default name lvol# is used where # is
the internal number of the logical volume.
The following sections provide examples of logical volume creation for the three types of logical
volumes you can create with LVM.
4.1.1. Creating Linear Volumes
When you create a logical volume, the logical volume is carved from a volume group using the
free extents on the physical volumes that make up the volume group. Normally logical volumes
use up any space available on the underlying physical volumes on a next-free basis. Modifying
the logical volume frees and reallocates space in the physical volumes.
The following command creates a logical volume 10 gigabytes in size in the volume group vg1.
lvcreate -L 10G vg1
The following command creates a 1500 megabyte linear logical volume named testlv in the
volume group testvg, creating the block device /dev/testvg/testlv.
lvcreate -L1500 -ntestlv testvg
3.14. Recreating a Volume Group Directory
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- Table of Contents 4
- 1. About This Guide 7
- 2. Audience 7
- 3. Software Versions 7
- 4. Related Documentation 7
- 5. Document Conventions 8
- Important 9
- 1. Logical Volumes 10
- 2. LVM Architecture Overview 11
- 3. Running LVM in a Cluster 12
- 4. Document Overview 13
- Chapter 2. LVM Components 15
- 2. Volume Groups 17
- 3. LVM Logical Volumes 17
- Figure 2.2. Extent Mapping 18
- 3.2. Striped Logical Volumes 20
- 3.3. Mirrored Logical Volumes 21
- 3.4. Snapshot Volumes 22
- Chapter 3. LVM Administration 24
- Overview 24
- 4. Logical Volume Backup 25
- 5. Logging 25
- • external log function 26
- LVM Configuration Files 26
- CLI Commands 27
- 3.1. Creating Volume Groups 31
- 3.3. Displaying Volume Groups 32
- 3.8. Removing Volume Groups 35
- 3.9. Splitting a Volume Group 35
- 3.10. Combining Volume Groups 35
- 3.12. Renaming a Volume Group 36
- 4.1. Creating Logical Volumes 37
- 4.3. Resizing Logical Volumes 41
- 4.5. Renaming Logical Volumes 42
- 4.6. Removing Logical Volumes 42
- 4.8. Growing Logical Volumes 43
- 5. Creating Snapshot Volumes 46
- 7. Online Data Relocation 48
- Nodes in a Cluster 48
- 9.1. Format Control 49
- 9.2. Object Selection 51
- Table 4.1. pvs Display Fields 52
- The vgs Command 53
- The lvs Command 54
- Table 4.3. lvs Display Fields 56
- 9.3. Sorting LVM Reports 57
- 9.4. Specifying Units 58
- Chapter 5. LVM Configuration 60
- Examples 60
- 1.4. Creating the File System 61
- 3. Splitting a Volume Group 62
- 3.1. Determining Free Space 63
- 3.2. Moving the Data 63
- 4.2.3. Moving the Data 66
- Volume Group 73
- Appendix A. The Device Mapper 76
- Appendix B. The LVM 77
- Configuration Files 77
- 2. Sample lvm.conf File 78
- Appendix C. LVM Object Tags 84
- Appendix D. LVM Volume Group 86
- Metadata 86
- 3. Sample Metadata 87
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