Lun/PV/VG/LV

Several Concepts in storage, refer to some network materials to redraw a picture, as shown below:

 

Lun: Lun is a logical concept for storage devices (such as disk arrays). It may be several hard disks physically. The storage resources on the host's HbA card are located based on two main features: the controller (target) and the Lun ID, this Lun is defined by the storage control system and is a part of the storage resources of the storage system.

PV: The PC is a physical volume that corresponds to the hard disk of the specific server or the Lun of the storage device;

VG: All PVS in the LVM system constitute a resource pool, that is, VG (volume group );

LV: A logical volume group is a logical Concept drawn out in VG and a subset of VG. Different file systems can be formatted on the LV;