Installation guide

Displaying Logical Volumes

[root@tng3-1 lvm]# lvremove /dev/testvg/testlv

Do you really want to remove active logical volume "testlv"? [y/n]: y

Logical volume "testlv" successfully removed

You could explicitly deactivate the logical volume before removing it with the lvchange -an

command, in which case you would not see the prompt verifying whether you want to remove an

active logical volume.

4.4.11. Displaying Logical Volumes

There are three commands you can use to display properties of LVM logical volumes: lvs,

lvdisplay, and lvscan.

The lvs command provides logical volume information in a configurable form, displaying one line per

logical volume. The lvs command provides a great deal of format control, and is useful for scripting.

For information on using the lvs command to customize your output, see Section 4.8, “Customized

Reporting for LVM”.

The lvdisplay command displays logical volume properties (such as size, layout, and mapping) in a

fixed format.

The following command shows the attributes of lvol2 in vg00. If snapshot logical volumes have been

created for this original logical volume, this command shows a list of all snapshot logical volumes and

their status (active or inactive) as well.

# lvdisplay -v /dev/vg00/lvol2

The lvscan command scans for all logical volumes in the system and lists them, as in the following

example.

# lvscan

ACTIVE '/dev/vg0/gfslv' [1.46 GB] inherit

4.4.12. Growing Logical Volumes

To increase the size of a logical volume, use the lvextend command.

When you extend the logical volume, you can indicate how much you want to extend the volume, or

how large you want it to be after you extend it.

The following command extends the logical volume /dev/myvg/homevol to 12 gigabytes.

# lvextend -L12G /dev/myvg/homevol

lvextend -- extending logical volume "/dev/myvg/homevol" to 12 GB

lvextend -- doing automatic backup of volume group "myvg"

lvextend -- logical volume "/dev/myvg/homevol" successfully extended

The following command adds another gigabyte to the logical volume /dev/myvg/homevol.