HP Serviceguard A.11.20- Managing Serviceguard Twentieth Edition, August 2011

3 Understanding Serviceguard Software Components
This chapter gives a broad overview of how the Serviceguard software components work. The
following topics are presented:
• Serviceguard Architecture
• How the Cluster Manager Works (page 44)
• How the Package Manager Works (page 50)
• How Packages Run
• How the Network Manager Works (page 67)
• Volume Managers for Data Storage
• Responses to Failures (page 88)
If you are ready to start setting up Serviceguard clusters, skip ahead to Chapter 5: “Building an
HA Cluster Configuration” (page 158).
Serviceguard Architecture
The following figure shows the main software components used by Serviceguard. This chapter
discusses these components in some detail.
NOTE: Veritas CFS may not yet be supported on the version of HP-UX you are running; see
“About Veritas CFS and CVM from Symantec” (page 23).
Figure 10 Serviceguard Software Components
Serviceguard Daemons
Serviceguard uses the following daemons:
• /usr/lbin/cmclconfd—Serviceguard Configuration Daemon
• /usr/lbin/cmcld—Serviceguard Cluster Daemon
40 Understanding Serviceguard Software Components