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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 | |
| +----------------------------------------+ |
| |
+------------------------------------------------+
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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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Generated: 2007-01-26 17:58:11