ServerNet Cluster 6780 Planning and Installation Guide (G06.24+, H06.03+)

Glossary
ServerNet Cluster 6780 Planning and Installation Guide—527301-004
Glossary-19
persistent process
persistent process. A process that must always be either waiting, ready, or executing.
These processes are usually controlled by a monitor process that checks on the status
of persistent processes and restarts them if necessary.
physical interface (PIF). The hardware components that connect a system node to a
network.
PIC. See plug-in card (PIC).
PIF. See physical interface (PIF).
ping. A utility used to verify connections to one or more remote hosts. The ping utility uses
the Internet control message protocol (ICMP) echo request and echo reply packets to
determine whether a particular IP system on a network is functional. The ping utility is
useful for diagnosing IP network or router failures.
planned outage. Time during which a system is not capable of doing useful work because
of a planned interruption. A planned outage can be time when the system or user
application is shut down to allow for servicing, upgrades, backup, or general
maintenance.
plug-in card (PIC). A replaceable component that provides a unique function when installed
in a CRU or FRU. For example, plug-in cards for the modular SEBs (MSEBs) provide a
choice of connection media for attaching ServerNet cables.
PMF CRU. See processor multifunction (PMF) CRU.
port. (1) A data channel that connects to other devices or computers. (2) A connector to
which a cable can be attached. The system transmits and receives data or requests
through ports on ServerNet adapters and processor multifunction (PMF) customer-
replaceable units (CRUs). A port is also called a connector. (3) The entrance or
physical access point (such as a connector) to a computer, multiplexer, device, or
network where signals are supplied, extracted, or observed.
position ID. A character that indicates the position a cluster switch occupies in one of the
star topologies. The position ID is a component of the two-character cluster switch
name. The cluster switch name includes an external fabric ID (X or Y) as the first
character and a position ID as the second character. For example, the cluster switch
name X3 indicates that the cluster switch serves the external ServerNet X fabric and
occupies position 3 in the topology. Position ID is not used in the layered topology.
primary path. A path enabled as the preferred path. When a primary path is disabled, an
alternate path becomes the primary path. Contrast with alternate path.
primary processor. The processor that is designated as owning the ServerNet addressable
controller (SAC) connected to separate processors running the HP NonStop™
operating system. The primary processor is the processor that has direct control over
the SAC. Contrast with backup processor.