Managing HP Serviceguard A.11.20.00 for Linux, June 2012

3 Understanding Serviceguard Software Components
This chapter gives a broad overview of how the Serviceguard software components work. It includes
the following topics:
• Serviceguard Architecture
• How the Cluster Manager Works (page 30)
• How the Package Manager Works (page 35)
• How Packages Run (page 46)
• How the Network Manager Works (page 54)
• Volume Managers for Data Storage (page 63)
• Responses to Failures (page 66)
If you are ready to start setting up Serviceguard clusters, skip ahead to Chapter 4, “Planning and
Documenting an HA Cluster.”
Serviceguard Architecture
The following figure shows the main software components used by Serviceguard for Linux. This
chapter discusses these components in some detail.
Figure 6 Serviceguard Software Components on Linux
Serviceguard Daemons
Serviceguard for Linux uses the following daemons:
• cmclconfd—configuration daemon
• cmcld—cluster daemon
• cmnetd—Network Manager daemon
Serviceguard Architecture 27