NonStop NS-Series Operations Guide (H06.03+)

Processors and Components: Monitoring and
Recovery
HP Integrity NonStop NS-Series Operations Guide—529869-001
9-8
Processor Halts
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 freeze-enabled. Two types of
processor halts display a processor halt code in the Processor Status dialog box:
•
A halt instruction results in a processor halt.
When the operating system detects a millicode or software error that it cannot
correct, it can execute a halt instruction to suspend all application and system
processes running in the associated processor. The status of the halted processor
becomes:
Halt code = %nnnnnn
Unlike a freeze instruction, a halt instruction affects only one processor.
•
A processor can be halted by a freeze instruction.
A freeze-enabled processor can be frozen by another frozen processor. When a
freeze instruction is executed, any processors that are freeze-enabled also freeze
immediately. When the operating system detects a software error that it cannot
correct, it can execute a freeze instruction to suspend all application and system
processes running in the associated processor. The status of the frozen processor
becomes:
Freeze code = %nnnnnn
If system freeze is enabled, the status for all other freeze-enabled processors
becomes:
Frozen by other processor
The Processor Halt Codes Manual documents processor halt codes.
OSM Alarms and Attribute Values
When the OSM Service Connection displays processor-related alarms or problem
attributes, the alarm and attribute details often indicate the appropriate recovery action.
Recovery actions might call for:
•
Trying the Recovery Operations for Processors on page 9-9.
•
Trying the Slice (NonStop Blade Element) and LSU troubleshooting tips,
documented on the CSSI web site.
•
Contacting your service provider.
Note. Do not freeze-enable a processor unless instructed to do so by your service provider.