LINUX

  What is LVM? LVM is a tool for logical volume management which includes allocating disks, striping, mirroring and resizing logical volumes. With LVM, a hard drive or set of hard drives is allocated to one or more  physical volumes . LVM physical volumes can be placed on other block devices which might span two or more disks. Storage volumes created under the control of the logical volume manager can be resized and moved around almost at will. Definitions Physical Volumes( PV ): This means the hard disk, hard disk partitions, RAID or LUNs from a SAN which form Physical Volumes  Volume Groups ( VG) :  This is a collection of one or more Physical Volumes. Logical Volumes( LV) :   LVs sit inside a Volume Group and form, in effect, a virtual partition. Physical Extents( PE):  In order to manipulate the actual data, it is divided into blocks of data called   P hysical   E xtents. Logical Extents( LE ) Similar to Physical Extents but at the Logical Vol...