Red Hat ENTERPRISE LINUX 4 - LVM ADMINISTRATOR Manual

Also see for ENTERPRISE LINUX 4 - DEVELOPER TOOLS GUIDE: Installation guide Installation guide Tuning guide Installation guide Manual

Contents

Chapter 4. LVM Administration with CLI Commands26logical volumes on individual nodes in a cluster, see Section 4.8, “Activating Logical Volumes onIndividual Nodes in a Cluster”.4.3.8. Removing Volume GroupsTo remove a volume group that contains no logical volumes, use the vgremove command.# vgremove officevgVolume group "officevg" successfully removed4.3.9. Splitting a Volume GroupTo split the physical volumes of a volume group and create a new volume group, use the vgsplitcommand.Logical volumes cannot be split between volume groups. Each existing logical volume must be entirelyon the physical volumes forming either the old or the new volume group. If necessary, however, youcan use the pvmove command to force the split.The following example splits off the new volume group smallvg from the original volume groupbigvg.# vgsplit bigvg smallvg /dev/ram15Volume group "smallvg" successfully split from "bigvg"4.3.10. Combining Volume GroupsTwo combine two volume groups into a single volume group, use the vgmerge command. You canmerge an inactive "source" volume with an active or an inactive "destination" volume if the physicalextent sizes of the volume are equal and the physical and logical volume summaries of both volumegroups fit into the destination volume groups limits.The following command merges the inactive volume group my_vg into the active or inactive volumegroup databases giving verbose runtime information.vgmerge -v databases my_vg4.3.11. Backing Up Volume Group MetadataMetadata backups and archives are automatically created on every volume group and logical volumeconfiguration change unless disabled in the lvm.conf file. By default, the metadata backup is storedin the /etc/lvm/backup file and the metadata archives are stored in the /etc/lvm/archivesfile. You can manually back up the metadata to the /etc/lvm/backup file with the vgcfgbackupcommand.The vgcfrestore command restores the metadata of a volume group from the archive to all thephysical volumes in the volume groups.