Ethernet Adapter Installation and Support Guide

Glossary
Ethernet Adapter Installation and Support Guide—425684-003
Glossary-57
memory manager
memory-exact points. Complex statements might contain several such points: at each
function call, privileged instruction, and embedded assignment. Contrast with
register-exact point.
memory manager. A HP NonStop™ Kernel operating system process that implements the
paging scheme for virtual memory. This process services requests generated by
different interrupt handlers as well as by other system processes.
memory page. A unit of virtual storage. In TNS systems, a memory page contains 2048
bytes. In TNS/R systems, the page size is determined by the memory manager and
can vary, depending on the processor type.
memory slot. One of eight slots for memory units on the processor and memory board
(PMB). The slots are labeled MS1 through MS8.
memory unit. A unit consisting of a dual inline memory module (DIMM) or a single inline
memory module (SIMM) that is installed in groups of four on the processor and
memory board (PMB) of the processor multifunction (PMF) customer-replaceable unit
(CRU). Memory units constitute the processor memory. The memory units in certain
models of PMF CRU are not replaceable by customers or in the field.
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).