NonStop S-Series Planning and Configuration Guide (G06.25+)

Glossary
HP NonStop S-Series Planning and Configuration Guide—523303-015
Glossary-62
message monitor process (MSGMON)
message monitor process (MSGMON). A helper process for the ServerNet cluster monitor
process (SNETMON) that runs in each processor on every node of a ServerNet
cluster. MSGMON is started by the persistence manager process, $ZPM. It performs
duties for SNETMON in those instances where SNETMON needs an agent in each
system processor. In addition, MSGMON monitors the connections within the
processor and reports changes back to SNETMON when required.
MFIOB. See multifunction I/O board (MFIOB).
MIC. See Media Interface Connector (MIC).
microcode. Any machine code or data that can run in a microprocessor. HP produces two
types of microcode for HP NonStop™ S-series systems: volatile and nonvolatile.
Volatile microcode is loaded into the volatile random-access memory (RAM) of some
types of printed wiring assemblies (PWAs) and is not retained in a host PWA when
power to the PWA is interrupted. For nonvolatile microcode, see firmware
. See also
millicode
.
millicode. RISC instructions that implement various TNS low-level functions such as
exception handling, real-time translation routines, and library routines that implement
the TNS instruction set. Millicode is functionally equivalent to TNS microcode
.
mirrored disk or volume. A pair of identical disk drives that are used together as a single
logical volume. One drive is considered primary, and the other is called the mirror.
Each byte of data written to the primary drive is also written to the mirror drive. If the
primary drive fails, the mirror drive can continue operations. See also volume
.
MMF PIC. See multimode fiber-optic (MMF) plug-in card (PIC).
MMF ServerNet cable. See multimode fiber-optic (MMF) ServerNet cable.
mode. The set of attributes that specify the type and access permissions for a file. See also
file mode
.
modular cabinet. A standard 19-inch rack equipped with doors, bezels, and, if necessary,
side panels and a power distribution unit (PDU)
.
modular ServerNet expansion board (MSEB). A ServerNet expansion board (SEB) that
uses plug-in cards (PICs) to provide a choice of connection media for routing
ServerNet packets.
module. (1) A set of components sharing a common interconnection, such as a backplane.
A module is a subset of a group, and it is usually contained in an enclosure. (2) A set
of I/O devices or services that share a common protocol and can be controlled by a
single module driver in the extensible I/O (XIO) subsystem.
MON object type. The Subsystem Control Facility (SCF) object type for the storage pool
master process.