Managing Serviceguard Nineteenth Edition, Reprinted June 2011

NOTE: Under agile addressing (see “About Device File Names (Device Special Files)” (page 77)),
the storage units in this example would have names such as disk1, disk2, disk3, etc.
As of A.11.20, Serviceguard supports cluster-wide DSFs, and HP recommends that you use them.
See “About Cluster-wide Device Special Files (cDSFs)” (page 99).
Figure 29 Physical Disks Within Shared Storage Units
Figure 30 shows the individual disks combined in a multiple disk mirrored configuration.
Figure 30 Mirrored Physical Disks
Figure 31 shows the mirrors configured into LVM volume groups, shown in the figure as /dev/
vgpkgA and /dev/vgpkgB. The volume groups are activated by Serviceguard packages for use
by highly available applications.
78 Understanding Serviceguard Software Components