Two Words About LVM
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- Logical Volume Manager (LVM) is a tool to decouple file-systems (and
raw devices) from the physical disks.
- with LVM, we create a volume group (vg), from one or more disks.
- On top of a vg, we can create logical volumes (lv).
- File-systems get created on top of the logical volumes.
- To add new capacity, we simply add a new device to the vg, and then
either create new logical volumes, or expand existing ones.
- Since the volumes are now not tied to physical devices, we can add
features such as snapshots, mirroring, etc.