This can be useful when migrating whole LVs to or from offline storage. VGs can be split or merged in situ as long as no LVs span the split.Creation of read-only snapshots of logical volumes (LVM1), leveraging a copy on write (CoW) feature, or read/write snapshots (LVM2).Logical volumes (LVs) can be resized online by concatenating extents onto them or truncating extents from them.Volume groups (VGs) can be resized online by absorbing new physical volumes (PVs) or ejecting existing ones.Various elements of the LVM Basic functionality LVM can be considered as a thin software layer on top of the hard disks and partitions, which creates an abstraction of continuity and ease-of-use for managing hard drive replacement, repartitioning and backup.
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