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An Overview of Logical Volume Management (LVM)
=== Volume Group (VG) ===
The Volume Group is the high level container which holds one or more logical volumes and physical volumes.
=== Physical Volume (PV) ===
A physical volume represents a storage device such as a disk drive or other storage media.
=== Logical Volume (LV) ===
A logical volume is the equivalent to a disk partition and, as with a disk partition, can contain a file system.
=== Physical Extent (PE) ===
Each physical volume (PV) is divided into equal size blocks known as physical extents.
=== Logical Extent (LE) ===
Each logical volume (LV) is divided into equal size blocks called logical extents.
Suppose we are creating a new volume group called VolGroup001. This volume group needs physical disk space in order to function so we allocate three disk partitions ''/dev/sda1'', ''/dev/sdb1'' and ''/dev/sdb2''. These become physical volumes in VolGroup001. We would then create a logical volume called LogVol001 within the volume group made up of the three physical volumes.
If we run out of space in LogVol001 we simply add more disk partitions as physical volumes and assign them to the volume group and logical volume.
== Getting Information about Logical Volumes ==

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