HP-UX 11i v1 Installation and Update Guide, September 2005

Choosing an Installation Method
Understanding Online Diagnostics
Chapter 3 57
Understanding Online Diagnostics
HP-UX 11i v1 automatically installs diagnostics on all systems to
provide required hardware support. The tools contained in the
OnlineDiag bundle give you a complete solution to verify, troubleshoot,
and monitor Itanium-based system hardware while the system is online.
You can use the OnlineDiag bundle to verify, troubleshoot, and monitor
many different types of Itanium-based system hardware including CPUs,
memory, interface cards, and mass storage and other devices.
CAUTION Uninstalling the OnlineDiag bundle prevents products with dependencies
on the diagnostics from functioning correctly.
Not installing OnlineDiag removes protections against hardware
failures that diagnostics provide. Without the tools, it is much harder to
troubleshoot and fix problems if a hardware failure occurs.
With a media install, the OnlineDiag bundle is installed by default with
any HP-UX 11i Operating Environment.
The tools in OnlineDiag:
• Protect you against some hardware failures, for example, some
memory problems.
• Provide EMS Hardware Monitors that notify you of hardware events
that may indicate impending hardware failure.
• Maintain logs that can give you critical help in determining the
cause of failures.
• Enable you to troubleshoot system problems.
For most computer systems, no special configuration of the diagnostics is
necessary.
For complete information, go to the Diagnostics Web site:
http://docs.hp.com/hpux/diag