What is LVM (logical Volume manager)

Understanding LVM (logical Volume manager)

Logical Volume Manager, or LVM, is a storage management solution that allows administrators to divide hard drive space into physical volumes (PV), which can then be combined into logical volume groups (VG), which are then divided into logical volumes (LV) on which the file system and mount point are created.

A logical volume group can include more than one physical volume, a mount point can include more than one physical hard drive, meaning the largest mount point can be larger than the biggest hard drive in the set. These logical volumes can be resized later if more disk space is needed for a particular mount point. After the mount points are created on logical volumes, a filesystem must be created on them.

LVM is used by default during installation for all mount points except the /boot partition, which cannot exist on a logical volume. This section discusses The LVM tools.

The LVM tools available after installation.

LVM Tool Description

pvcreate Create physical volume from a hard drive

vgcreate Create logical volume group from one or more physical volumes

vgextend Add a physical volume to an existing volume group

vgreduce Remove a physical volume from a volume group

lvcreate Create a logical volume from available space in the volume group

lvextend Extend the size of a logical volume from free physical extents in the logical volume group

lvremove Remove a logical volume from a logical volume group, after unmounting it

vgdisplay Show properties of existing volume group

lvdisplay Show properties of existing logical volumes

pvscan Show properties of existing physical volumes

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