Why LVM?

In traditional Storage System, there were many limitation:

1. Requirement of Contiguous Disk Space
2. Max partition size=Max Disk size (i.e Partition size cannot span multiple disks)
Thus no file system can be larger than Disk size
3. Pre-plan the partition size requirement, as after creation of partition, the partition cannot be resized.

To tackle with these problems, LVM (Logical Volume Manager) was developed.

Benefits of LVM:

1. LV solves the non-contiguous disk space requirement
2. LV can span to mulitiple disks
3. Dynamically increase LV size
4. LV can be mirrored
5. Harddisk easily added to the system.
6. LV can be relocated.