LVM HOWTO
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Chapter 3. Anatomy of LVM

Table of Contents
3.1. volume group (VG)
3.2. physical volume (PV)
3.3. logical volume (LV)
3.4. physical extent (PE)
3.5. logical extent (LE)
3.6. Tying it all together
3.7. mapping modes (linear/striped)
3.8. Snapshots

This diagram gives a overview of the main elements in an LVM system:
+-- Volume Group --------------------------------+ | | | +----------------------------------------+ | | PV | PE | PE | PE | PE | PE | PE | PE | PE | | | +----------------------------------------+ | | . . . . | | . . . . | | +----------------------------------------+ | | LV | LE | LE | LE | LE | LE | LE | LE | LE | | | +----------------------------------------+ | | . . . . | | . . . . | | +----------------------------------------+ | | PV | PE | PE | PE | PE | PE | PE | PE | PE | | | +----------------------------------------+ | | | +------------------------------------------------+

Another way to look at is this (courtesy of Erik BЕgfors on the linux-lvm mailing list):
hda1 hdc1 (PV:s on partitions or whole disks) \ / \ / diskvg (VG) / | \ / | \ usrlv rootlv varlv (LV:s) | | | ext2 reiserfs xfs (filesystems)

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Benefits of Logical Volume Management on a Large System		volume group (VG)