ServerNet Cluster 6780 Operations Guide (G06.28+, H06.05+)

Glossary
ServerNet Cluster 6780 Operations Guide—525606-003
Glossary-15
message monitor process (MSGMON)
message monitor process (MSGMON). A helper process for SNETMON that runs in each
processor on every node of a ServerNet cluster. MSGMON is started by $ZPM (the
persistence manager process). 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).
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.
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. See also ServerNet expansion board (SEB).
module. 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. In a NonStop
S-series server, there is one module in a group.
MRouter. A field-programmable gate array (FPGA) or application-specific integrated circuit
(ASIC) that is part of the serial maintenance bus (SMB) architecture. The MRouter
distributes the SMB throughout a group.
(M)SEB. SEB or MSEB. See ServerNet expansion board (SEB) and modular ServerNet
expansion board (MSEB).
MSEB. See modular ServerNet expansion board (MSEB).
MSEB CBB. See MSEB common base board (CBB).
MSEB common base board (CBB). In modular ServerNet expansion boards (MSEBs), the
printed wiring assembly (PWA) into which plug-in cards (PICs) are installed.
MSEB port. A connector on modular ServerNet expansion boards (MSEBs) used for
ServerNet links. An MSEB has four fixed serial-copper-based ports and six plug-in card
(PIC) slots that accept a variety of connection media. See also SEB port.
MSGMON. See message monitor process (MSGMON).
MSP. See master service processor (MSP).
multifunction I/O board (MFIOB). A ServerNet adapter that contains ServerNet
addressable controllers (SACs) for SCSI and Ethernet; a service processor (SP);
ServerNet links to the processor, to the two ServerNet adapter slots, and to one of the
ServerNet expansion board (SEB) slots; and connections to the serial maintenance
bus (SMB), which connects components within an enclosure to the service processor.