Managing HP Serviceguard A.11.20.10 for Linux, December 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 36)
• How the Package Manager Works (page 41)
• How Packages Run (page 51)
• How the Network Manager Works (page 59)
• Volume Managers for Data Storage (page 68)
• Responses to Failures (page 72)
If you are ready to start setting up Serviceguard clusters, skip ahead to Chapter 4, “Planning and
Documenting an HA Cluster.”
3.1 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
3.1.1 Serviceguard Daemons
Serviceguard for Linux uses the following daemons:
• cmclconfd—configuration daemon
• cmcld—cluster daemon
• cmnetd—Network Manager daemon
3.1 Serviceguard Architecture 31