TCP/IP (Parallel Library) Migration Guide

Glossary
HP NonStop TCP/IP (Parallel Library) Migration Guide—522272-003
Glossary-8
persistence
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 manager. A NonStop Kernel subsystem process ($ZPM) that starts generic
processes on G-series RVUs and manages their persistence.
physical interface (PIF). The hardware components that connect a system node to a
network.
PIF. See physical interface (PIF).
PMF. See processor multifunction (PMF) CRU.
process. A running entity that is managed by the operating system, as opposed to a
program, which is a collection of code and data. When a program is taken from a file
on a disk and run in a processor, the running entity is called a process.
processor multifunction (PMF) CRU. A NonStop S-series customer-replaceable unit
(CRU) that contains a power supply, service processor (SP), ServerNet router,
Ethernet controller, three ServerNet addressable controllers (SACs), and a processor
and memory system in a single unit. The PMF CRU consists of three subassemblies:
the processor and memory board (PMB), the multifunction I/O board (MFIOB), and the
power supply subassembly.
programmatic command. In DSM, a command issued by a program rather than by a
human operator.
protocol. A formal description of message formats and the rules two or more machines
must follow to exchange those messages. Protocols can describe low level details of
machine-to-machine interfaces (for example, the order in which the bits from a byte are
sent across a wire), or high-level exchanges between application programs (for
example, the way in which two programs transfer a file across the Internet). Most
protocols include both intuitive descriptions of the expected interactions as well as
more formal specifications using finite state-machine models.
QIOLIB. The library is a set of procedures for QIO functions used by client processes, the
QIOMON process, and the DIH. Library procedures are used to manage the shared
memory segment and the interface between the client processes and the DIH. The
QIO library interface is an internal Tandem interface and is not documented.
round-robin filtering. A feature of Parallel Library TCP/IP that allows the adapter to
distribute incoming connections to multiple listening processes in different processors
sharing the same port. The incoming connections are distributed to the first listening
process in line, then the second, then the third, and so on, until the last listening
process is reached, at which point the distribution returns again to the first listening
process in line.
SAC. See ServerNet addressable controller (SAC).