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LVM Terminology:
LVM (Logical Volume Manager)
Logical
Volume Manager (shorted as LVM) is a disk management subsystem which has quite a different manner than normal disk partition in the operating system.
We define it as a series of collections of operating system calls, libraries
and other tools for creating and controlling logical volume region. LVM maps
real physical disk into simple, flexible and virtual logical storage view so as
to control disk resources. Therefore, it is a reconsideration of methods to
manage the file system and volume -- the subsystem adds an extra abstract
layer underneath the file system management;
it is unnecessary to pursue deep understanding in details, one can realize
functions such as realizing virtual partitions, or dynamically creating a
logical volume and revising volume size, the permission of the file system
surpassing disks, etc. LVM provides a higher viewpoint on disk storage compared
with traditional disk and partition, which authorizes a system administrator
with higher flexibility to assign disk space towards applications and users.