What is an LVM ?
LVM stands for Logical Disk Manager which is the fundamental way to manage UNIX/Linux storage systems in a scalable manner. An LVM abstracts disk devices into pools of storage space called Volume Groups. These volume groups are in turn subdivided into virtual disks called Logical Volumes. The logical volumes may be used just like regular disks with filesystem created on them and mounted in the Unix/Linux filesystem tree. The logical volumes can span multiple disks.
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