NonStop System Glossary

periodic incident report
A type of incident report that is generated periodically to test the connection to the service provider
and report the current system configuration. The default frequency is 20 days.
peripheral enclosure
An enclosure that contains components related to one or more peripherals. The 519x tape subsystem
is an example of a peripheral enclosure. Peripheral enclosures are not part of the set of system
enclosures. Contrast with system enclosure.
Peripheral Utility Program (PUP)
A utility used in D-series and earlier release version updates (RVUs) to manage disks and other
peripheral devices. In G-series RVUs, similar functions are performed by the Subsystem Control
Facility (SCF).
persistence
For the Subsystem Control Facility (SCF), the capability of a generic process to restart automatically
if it was stopped abnormally. You configure this capability by specifying a nonzero AUTORESTART
value in an ADD command.
persistence count
The number of times the $ZPM persistence manager process will restart a generic process that has
been terminated abnormally. A generic process with an AUTORESTART value of 10 (the maximum)
is said to have a persistence count of 10. See also persistence.
persistence manager process
The $ZPM process that is started and managed by the $ZCNF configuration utility process and
that starts generic processes and manages their persistence.
persistent configuration
A configuration that remains the same from one system load to another.
persistent process
A process that must always be either waiting, ready, or executing. Persistent processes are usually
controlled by a monitor process that checks on the status of persistent processes and restarts them
if necessary.
PFAIL
See power fail (PFAIL).
physical interface
In the CIP subsystem, a physical Ethernet port, named by the CLIM kernel as eth0, eth1, and so
on. Each physical interface can provide link pulse information.
physical interface (PIF)
The hardware components that connect a system node to a network.
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