HP Instant Capacity Version 10.x User Guide (762794-001, March 2014)

LPMC deactivations in vPars
In a vPar environment, if the LPMC monitor deactivates a core, it automatically replaces the failing
core with an iCAP core from the free pool, if such a core is available. The failing core remains in
the virtual partition until either the virtual partition or the virtual partition monitor is rebooted.
For more information about LPMC in vPars, see the various white papers available at the BSC
website (search for “LPMC”):
www.hp.com/go/bizsupport.
Failed monarch processors (HP-UX)
Monarch processors that are failing with an LPMC are not instantly replaced. When a monarch
processor experiences an LPMC, the LPMC monitor marks the processor for deconfiguration;
however, the LPMC monitor cannot deactivate the processor until the system is rebooted. Deactivation
of a monarch processor is not possible because it is the controlling processor of the operating
system (CPU 0). Therefore, the system cannot replace a (failing) monarch processor.
If your system has only one active processor, that processor is considered a monarch processor
and it cannot be replaced on line. A reboot of the system is required to replace the failing monarch
processor.
If there are multiple active processors in your system, one of them is designated as the monarch
processor, and the other (nonmonarch) processors can be replaced on line. If the monarch processor
fails, it cannot be replaced without a reboot.
Replacement of failed cores on OpenVMS
If a core is experiencing correctable errors, shut it down and start up another iCAP core, thereby
keeping the active-core count constant.
If a core experiences a fatal problem leading to a system crash, upon reboot you can start another
iCAP core, thereby replacing the failed core and keeping the active-core count constant.
Failed OpenVMS primary processors
An OpenVMS primary processor that is failing cannot be instantly replaced.
If your system has only one active processor, it is considered a primary processor and it cannot
be replaced on line. A reboot of the system is required to replace the failing primary processor.
If there are multiple active processors in your system, one of them is designated as the primary
processor and the other (nonprimary) processors can be replaced on line. If the primary processor
fails, it cannot be replaced without a reboot.
Replacement of failed cores 51