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Chapter 4. LVM Administration with CLI Commands
30
4.3.8. Activating and Deactivating Volume Groups
When you create a volume group it is, by default, activated. This means that the logical volumes in
that group are accessible and subject to change.
There are various circumstances for which you need to make a volume group inactive and thus
unknown to the kernel. To deactivate or activate a volume group, use the -a (--available)
argument of the vgchange command.
The following example deactivates the volume group my_volume_group.
# vgchange -a n my_volume_group
If clustered locking is enabled, add ’e’ to activate or deactivate a volume group exclusively on one
node or ’l’ to activate or/deactivate a volume group only on the local node. Logical volumes with single-
host snapshots are always activated exclusively because they can only be used on one node at once.
You can deactivate individual logical volumes with the lvchange command, as described in
Section 4.4.8, “Changing the Parameters of a Logical Volume Group”, For information on activating
logical volumes on individual nodes in a cluster, see Section 4.7, “Activating Logical Volumes on
Individual Nodes in a Cluster”.
4.3.9. Removing Volume Groups
To remove a volume group that contains no logical volumes, use the vgremove command.
# vgremove officevg
Volume group "officevg" successfully removed
4.3.10. Splitting a Volume Group
To split the physical volumes of a volume group and create a new volume group, use the vgsplit
command.
Logical volumes cannot be split between volume groups. Each existing logical volume must be entirely
on the physical volumes forming either the old or the new volume group. If necessary, however, you
can use the pvmove command to force the split.
The following example splits off the new volume group smallvg from the original volume group
bigvg.
# vgsplit bigvg smallvg /dev/ram15
Volume group "smallvg" successfully split from "bigvg"
4.3.11. Combining Volume Groups
To combine two volume groups into a single volume group, use the vgmerge command. You can
merge an inactive "source" volume with an active or an inactive "destination" volume if the physical
- Red Hat Enterprise Linux 6 1
- Logical Volume 1
- Manager Administration 1
- Administration 2
- LVM Administrator Guide 2
- Edition 1 2
- Introduction 7
- 5. We Need Feedback! 8
- 6. Document Conventions 8
- 6.2. Pull-quote Conventions 10
- 6.3. Notes and Warnings 10
- Notes and Warnings 11
- 1.1. New and Changed Features 13
- 1.2. Logical Volumes 14
- # chkconfig clvmd on 17
- # service clvmd start 17
- 1.5. Document Overview 18
- LVM Components 21
- 2.2. Volume Groups 22
- 2.3. LVM Logical Volumes 23
- 2.3.4. Snapshot Volumes 26
- LVM Administration Overview 29
- 3.4. Logical Volume Backup 30
- 3.5. Logging 31
- LVM Administration with CLI 33
- Commands 33
- 4.3.1. Creating Volume Groups 37
- 4.3.9. Removing Volume Groups 42
- # vgmerge -v databases my_vg 43
- # lvconvert -m1 vg00/lvol1 51
- # lvconvert -m0 vg00/lvol1 51
- # lvconvert --merge @some_tag 53
- # lvreduce -l -3 vg00/lvol1 54
- # lvchange -pr vg00/lvol1 54
- # lvrename vg02 lvold lvnew 54
- 4.6. Online Data Relocation 60
- 4.8.1. Format Control 61
- 4.8.2. Object Selection 63
- The vgs Command 65
- The lvs Command 66
- 4.8.3. Sorting LVM Reports 69
- 4.8.4. Specifying Units 69
- LVM Configuration Examples 71
- 5.3. Splitting a Volume Group 73
- 5.3.1. Determining Free Space 74
- 5.3.2. Moving the Data 74
- 5.4.2.3. Moving the Data 77
- LVM Troubleshooting 81
- Appendix A. The Device Mapper 91
- offsetN 94
- 0 65536 error 97
- A.2. The dmsetup Command 101
- A.2.2. The dmsetup ls Command 102
- dmsetup command 107
- B.2. Sample lvm.conf File 109
- Sample lvm.conf File 111
- Appendix C. LVM Object Tags 121
- Appendix D. LVM Volume Group 123
- Metadata 123
- D.3. Sample Metadata 124
- Sample Metadata 125
- Appendix E. Revision History 127
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