HP Serviceguard A.11.20- Managing Serviceguard Twentieth Edition, August 2011

Figure 31 Multiple Devices Configured in Volume Groups
Examples of Storage on Disk Arrays
Figure 32 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 32 Physical Disks Combined into LUNs
NOTE: LUN definition is normally done using utility programs provided by the disk array
manufacturer. Since arrays vary considerably, you should refer to the documentation that
accompanies your storage unit.
Figure 33 shows LUNs configured with multiple paths (links) to provide redundant pathways to the
data.
82 Understanding Serviceguard Software Components