Disk space management is always a frustrating job. The situation would become even more challenging when one of your partitions on a disk runs out of space. Here the LVM comes to the rescue.
Logical Volume Manager (LVM) is used to manage storage devices, by utilizing the kernel’s device mapper feature to provide an additional layer of abstraction on the underlying physical disk layout. This makes the disk space management very flexible and provides many features, like the ability to add space to a logical volume even when the filesystems are mounted and active.