Managing HP Serviceguard for Linux, Tenth Edition, September 2012

sizes and types. File systems or databases used by the applications in the cluster are
mounted on these logical volumes. In Serviceguard clusters, volume groups are activated
by package control scripts when an application starts up, and they are deactivated by
package control scripts when the application halts.
Storage on Arrays
Figure 26 shows LUNs configured on a storage array. Physical disks are configured by
an array utility program into logical units, or LUNs, which are seen by the operating
system.
Figure 26 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.
For information about configuring multipathing, see “Multipath for Storage ” (page 94).
82 Understanding Serviceguard Software Components