Features
The LVM can:
- Resize volume groups online by absorbing new physical volumes (PV) or ejecting existing ones.
- Resize logical volumes (LV) online by concatenating extents onto them or truncating extents from them.
- Create read-only snapshots of logical volumes (LVM1).
- Create read-write snapshots of logical volumes (LVM2).
- Stripe whole or parts of logical volumes across multiple PVs, in a fashion similar to RAID 0.
- Mirror whole or parts of logical volumes, in a fashion similar to RAID 1.
- Move online logical volumes between PVs.
- Split or merge volume groups in situ (as long as no logical volumes span the split). This can be useful when migrating whole logical volumes to or from offline storage.
The LVM will also work in a shared-storage cluster (where disks holding the PVs are shared between multiple host computers), but requires an additional daemon to propagate state changes between cluster nodes.
LVM does not:
- Provide parity-based redundancy across LVs, as with RAID levels 3 through 6. This functionality is instead provided by the Linux multiple disk subsystem, which can be used as LVM physical volumes.
Read more about this topic: Logical Volume Manager (Linux)
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