Managing HP Serviceguard for Linux, Sixth Edition, August 2006

Understanding Serviceguard Software Components
How the Package Manager Works
Chapter 3 45
How the Package Manager Works
Each node in the cluster runs an instance of the package manager; the
package manager residing on the cluster coordinator is known as the
package coordinator.
The package coordinator does the following:
• Decides when and where to run, halt or move packages.
The package manager on all nodes does the following:
• Executes the user-defined control script to run and halt packages
and package services.
• Reacts to changes in the status of monitored resources.
A package starts up on an appropriate node 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:
Figure 3-5 Package Moving During Failover