Chapter 3. Anatomy of LVM
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Table of Contents
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3.1. volume group (VG)
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3.2. physical volume (PV)
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3.3. logical volume (LV)
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3.4. physical extent (PE)
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3.5. logical extent (LE)
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3.6. Tying it all together
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3.7. mapping modes (linear/striped)
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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 Bågfors
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 |
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volume group (VG) |
