NonStop Operations Guide for H-Series and J-Series RVUs

HP SIM for NonStop Manageability for these procedures and the supported Power Regulator
modes.
Monitoring Processor Performance Using ViewSys
Use the ViewSys product to view system resources online and to see information on system
performance. ViewSys provides information about processor activity. Using ViewSys, you can list
the processors on your system and determine their status. For more information, refer to “ViewSys”
(page 226).
To use ViewSys to obtain information about processor activity, at a TACL prompt:
> VIEWSYS
A series of bar graphs that summarize processor performance statistics appears on your terminal.
NOTE: The Measure utility also collects and displays statistics about system performance and
the performance of processors and other system components. Operations management personnel
often use this utility to help fine-tune and balance a system. For instructions on using this utility,
refer to the Measure User’s Guide and the Measure Reference Manual.
After the first ViewSys screen appears, press F1 to view processor busy statistics:
To exit ViewSys, press F16.
Identifying Processor Problems
Processor problems include system hangs, processor halts, OSM alarms.
Processor or System Hangs
A processor hang occurs when system components wait for an event that is not going to happen.
An unexpected event such as a deadlock (two or more processors waiting for each other) might
have occurred. In some cases, the entire system might hang, or be unresponsive.
Processor Halts
When certain errors occur (such as when data integrity is at risk), the operating system cannot
correct the problem and must halt all application and system processes running in the associated
processor. The remaining running processors in the system each send a message, reporting the
halted processor as down. The other processors in the system, including the backup to the halted
processor, are not affected by the errors that caused the processor to halt unless they are
128 Processors and Components: Monitoring and Recovery