Managing Serviceguard Eighteenth Edition, September 2010

Package Types
Three different types of packages can run in the cluster; the most common is the failover
package. There are also special-purpose packages that run on more than one node at
a time, and so do not failover. They are typically used to manage resources of certain
failover packages.
Non-failover Packages
There are two types of special-purpose packages that do not fail over and that can run
on more than one node at the same time: the system multi-node package, which runs
on all nodes in the cluster, and the multi-node package, which can be configured to
run on all or some of the nodes in the cluster. System multi-node packages are reserved
for use by HP-supplied applications, such as Veritas Cluster Volume Manager (CVM)
and Cluster File System (CFS).
The rest of this section describes failover packages.
Failover Packages
A failover package starts up on an appropriate node (see node_name on (page 289)) when
the cluster starts. A package failover takes place when the package coordinator initiates
the start of a package on a new node. A package failover involves both halting the
existing package (in the case of a service, network, or resource failure), and starting
the new instance of the package.
Failover is shown in the following figure:
68 Understanding Serviceguard Software Components