Backing Up And Restoring Volume Group Configuration - HP -UX 11i Administrator's Manual
Logical volume management
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Also See for HP-UX 11i:
- Administration manual (622 pages) ,
- Installation and update manual (149 pages) ,
- Getting started manual (50 pages)
Table of Contents
1.
Split the logical volume /dev/vg00/lvol1 into two separate logical volumes as follows:
# lvsplit /dev/vg00/lvol1
This creates the new logical volume /dev/vg00/lvol1b. The original logical volume /dev/
vg00/lvol1 remains online.
2.
Perform a file system consistency check on the logical volume to be backed up as follows:
# fsck /dev/vg00/lvol1b
3.
Mount the file system as follows:
# mkdir /backup_dir
# mount /dev/vg00/lvol1b /backup_dir
4.
Perform the backup using the utility of your choice.
5.
Unmount the file system as follows:
# umount /backup_dir
6.
Merge the split logical volume back with the original logical volume as follows:
# lvmerge /dev/vg00/lvol1b /dev/vg00/lvol1
NOTE:
lvsplit is not supported on snapshot logical volumes. lvmerge is not supported for
snapshots as well as logical volumes having snapshots.
Backing Up and Restoring Volume Group Configuration
It is important that volume group configuration information be saved whenever you make any
change to the configuration such as:
Adding or removing disks to a volume group
Changing the disks in a root volume group
Creating or removing logical volumes
Extending or reducing logical volumes
Unlike fixed disk partitions or nonpartitioned disks that begin and end at known locations on a
given disk, each volume group configuration is unique, changes, and uses space on several disks.
If you back up your volume group configuration, you can restore a corrupted or lost LVM
configuration in the event of a disk failure or corruption of your LVM configuration information.
The vgcfgbackup command creates or updates a backup file containing the volume group
configuration; it does not back up the data within your logical volumes. To simplify the backup
process, vgcfgbackup is invoked automatically whenever you make a configuration change as
a result of using any of the following commands:
lvchange
lvreduce
pvchange
vgreduce
1
For volume group Version 2.2 and higher, the vgchange command automatically takes a backup of the volume group
configuration during deactivation, provided they are not activated in read-only mode. In all earlier versions, there is
no automatic backup when vgchange is used.
When snapshots are involved, the volume group configuration changes with respect to the snapshot data unsharing
while writes are occurring on the snapshot tree. So, it is recommended that the automatic backup of the volume group
configuration not be overridden by the —A n option during volume group deactivation.
You can display LVM configuration information previously backed up with vgcfgbackup or
restore it using vgcfgrestore.
lvcreate
lvextend
lvremove
lvrmboot
pvmove
vgchange
lvlnboot
lvsplit
1
vgextend
lvmerge
vgcreate
vgmodify
Common LVM Tasks
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Troubleshooting
