Managing Serviceguard 12th Edition, March 2006

Planning and Documenting an HA Cluster
Package Configuration Planning
Chapter 4164
Package Configuration Planning
Planning for packages involves assembling information about each group
of highly available services. Some of this information is used in creating
the package configuration file, and some is used for editing the package
control script.
NOTE LVM Volume groups that are to be activated by packages must also be
defined as cluster aware in the cluster configuration file. See the
previous section on “Cluster Configuration Planning.” VERITAS disk
groups that are to be activated by packages must be defined in the
package configuration ASCII file, described below.
Logical Volume and File System Planning
You may need to use logical volumes in volume groups as part of the
infrastructure for package operations on a cluster. When the package
moves from one node to another, it must be able to access data residing
on the same disk as on the previous node. This is accomplished by
activating the volume group and mounting the file system that resides
on it.
In Serviceguard, high availability applications, services, and data are
located in volume groups that are on a shared bus. When a node fails, the
volume groups containing the applications, services, and data of the
failed node are deactivated on the failed node and activated on the
adoptive node. In order to do this, you have to configure the volume
groups so that they can be transferred from the failed node to the
adoptive node.
As part of planning, you need to decide the following:
• What volume groups are needed?
• How much disk space is required, and how should this be allocated in
logical volumes?
• What file systems need to be mounted for each package?
• Which nodes need to import which logical volume configurations?