NonStop Systems Introduction for H-Series RVUs

Glossary
NonStop Systems Introduction for H-Series RVUs—540083-001
Glossary-6
LAN.
LAN. See local area network (LAN).
linear expandability. The linear relationship between the number of processors in a
NonStop system and the performance of the system. That is, adding a processor to a
NonStop system adds an entire processor’s worth of performance to the system.
link. An open of a server process within a server class. The server can then provide
services to a client process.
link management. The act of coordinating the sharing of links between client processes
and server processes.
load balancing. The act of distributing or balancing the server application workload among
a set of processors or server processes.
local area network (LAN). A set of computers and other electronic devices linked to create
an interoffice or intersite network.
logical processor. See processor.
message system. See NonStop message system.
mirrored disk. A pair of identical disk drives that are used together as a single logical
volume. One drive is considered the primary, and the other is called the backup or
mirror. Each byte of data written to the primary drive is also written to the mirror drive. If
the primary drive fails, the backup drive can continue operations.
multifunction I/O board (MFIOB). A ServerNet adapter that contains ServerNet
addressable controllers (SACs) for SCSI and Ethernet; a service processor; 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.
multiprocessor system. A computer system, including all NonStop systems, that has more
than one processor.
network. A group of interconnected computer systems and devices and the hardware and
software used to connect them.
node. One member of a group of devices that can send or receive transmissions through a
defined network. The network can comprise a set of whole systems, such as an
Expand network, or a set of processors, such as a system area network (SAN). Each
node is separately addressable by a node identifier.
NonStop Blade Complex. The basic building block of the NS-series NonStop server,
consisting of two NonStop Blade Elements (duplex processor) or three NonStop Blade
Elements (triplex processor) A NonStop S-series system includes up to four NonStop
Blade Complexes.