Managing Serviceguard Nineteenth Edition, Reprinted June 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 42)
• How the Package Manager Works (page 48)
• How Packages Run
• How the Network Manager Works (page 64)
• Volume Managers for Data Storage
• Responses to Failures (page 85)
If you are ready to start setting up Serviceguard clusters, skip ahead to Chapter 5: “Building an
HA Cluster Configuration” (page 149).
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 22).
Figure 10 Serviceguard Software Components
Apps/Services/Resources
Package Manager
Cluster Manager
Network Manager
Volume Manager Software
HP-UX Kernel
Packages
Serviceguard
Components
Operating
System
Application Support Packages
Vx CFS Cluster Manager
CFS
components
SG CFS Cluster Membership Manager
Vx CFS System Package
Serviceguard
Packages
Serviceguard Daemons
Serviceguard uses the following daemons:
• /usr/lbin/cmclconfd—Serviceguard Configuration Daemon
• /usr/lbin/cmcld—Serviceguard Cluster Daemon
38 Understanding Serviceguard Software Components