LVM (Logical Volume Management) partitions provide a number of advantages over standard partitions. LVM partitions are formatted as
. One or more physical volumes are combined to form a
. Each volume group's total storage is then divided into one or more
. The logical volumes function much like standard partitions. They have a file system type, such as
, and a mount point.
The /boot Partition and LVM
The boot loader cannot read LVM volumes. You must make a standard, non-LVM disk partition for your
To understand LVM better, imagine the physical volume as a pile of blocks. A block is simply a storage unit used to store data. Several piles of blocks can be combined to make a much larger pile, just as physical volumes are combined to make a volume group. The resulting pile can be subdivided into several smaller piles of arbitrary size, just as a volume group is allocated to several logical volumes.
An administrator may grow or shrink logical volumes without destroying data, unlike standard disk partitions. If the physical volumes in a volume group are on separate drives or RAID arrays then administrators may also spread a logical volume across the storage devices.
You may lose data if you shrink a logical volume to a smaller capacity than the data on the volume requires. To ensure maximum flexibility, create logical volumes to meet your current needs, and leave excess storage capacity unallocated. You may safely grow logical volumes to use unallocated space, as your needs dictate.
LVM and the Default Partition Layout
By default, the installation process creates
/ and swap partitions within LVM volumes, with a separate