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Creating LVMs with Disk Druid
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Creating logical volumes involves several steps. First, you create physical LVM partitions, then the volume groups you place these partitions in, and then from the volume groups, you create the logical volumes for which you then specify mount points and file system types. On Red Hat, you can create LVM partitions during the installation process using Disk Druid. In Disk Druid, click New and select physical volume (LVM) for the File System Type. Create an LVM physical partition for each partition you want on your hard disks. Once you have created LVM physical partitions, you click the LVM button to create your logical volumes. You first need to assign the LVM physical partitions to volume groups. Volume groups are essentially logical hard drives. You could assign LVM physical partitions from different hard disks to the same volume group, letting the volume group span different hard drives. Once the volume groups are created, you are ready to create your logical volumes. You can create several logical volumes within each group. The logical volumes function like partitions. You will have to specify a file system type and mount point for each logical volume you create.
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On Red Hat, you can create logical volumes either during the installation process, or later use a collection of LVM tools to manage your LVM volumes, adding new LVM physical partitions and removing current ones. LVM maintains configuration information in the /etc/lvmconf directory.
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You can use pvdisplay, vgdisplay, and lvdisplay commands to show detailed information about a physical partition, volume groups, and logical volumes. pvscan, vgscan, and lvscan list your physical, group, and logical volumes.
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Managing LVM Physical Volumes
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A physical volume can be any hard disk partition or RAID device. A RAID device is seen as a single physical volume. 6 You can create physical volumes either from a single hard disk or from partitions on a hard disk. On very large 6 systems with many hard disks, you would more likely use an entire hard disk for each physical volume. To create a new physical volume, you initialize it with the pvcreate command with the partition's device name, as shown here: pvcreate /dev/hda3 To initialize a physical volume on an entire hard disk, you use the hard disk device name, as shown here: pvcreate /dev/hdc Then, use the vgextend command to add the partition to a logical group, in this case, rabbit. In effect, you are extending the size of the logical group by adding a new physical partition. vgextend rabbit /dev/hda3
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To remove a physical partition, first remove it from its logical volume. You may have to use the pmove command
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to move any data off the physical partition. Then, use the vgreduce command to remove it from its logical group.
Managing LVM Groups
You can manually create a volume group using the vgcreate command and the name of the group along with a list of physical partitions you want in the group. The following example creates a group called rabbit consisting of three physical partitions, /dev/hda3, /dev/hdb4, and /dev/hdb4. vgcreate rabbit /dev/hda3 /dev/hdb2 /dev/hdb4
You can remove a volume group by first deactivating it with vgchange -a n operation and then using the vgremove command.
Activating Volume Groups
Whereas in a standard file system structure, you mount and unmount hard disk partitions, with an LVM structure, you activate and deactivate entire volume groups. The group volumes are accessible until you activate them with the vgchange command with the -a option. To activate a group, first reboot your system, and then enter the vgchange command with the -a option and the y argument to activate the logical group (an n argument will deactivate the group). vgchange -a y rabbit
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