Managing Serviceguard 12th Edition, March 2006

Understanding Serviceguard Software Components
Volume Managers for Data Storage
Chapter 3 115
Figure 3-22 Multiple Devices Configured in Volume Groups
Examples of Storage on Disk Arrays
Figure 3-23 shows an illustration of storage configured on a disk array.
Physical disks are configured by an array utility program into logical
units or LUNs which are then seen by the operating system.
Figure 3-23 Physical Disks Combined into LUNs