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LVM Logical Volumes

The use of logical volumes is similar to the use of partitions and is accomplished with the same standard commands (mkfs, mount, fsck, df, ...)

LVM Volume Groups

A volume group (vg) is an abstraction layer between block devices and logical volumes. The commands used to manage a volume group start with vg

LVM Physical Volumes

A physical volume (pv) is any block device (a disk, a partition, a RAID device, an iSCSI device, etc.)