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What is LVM (Logical Volume Manager)?

A storage management framework that provides flexible disk management through abstract layers of physical and logical volumes.

LVM adds a layer of abstraction between physical disks and filesystems. Physical Volumes (PVs) are grouped into Volume Groups (VGs), from which Logical Volumes (LVs) are created. This allows dynamic resizing, snapshots, and spanning multiple disks.

Key advantages include resizing volumes without unmounting, creating snapshots for backups, migrating data between disks, and striping data across multiple drives for performance.

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