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

Glossary
ServerNet Cluster 6780 Operations Guide—525606-003
Glossary-8
Expand network
Expand network. The NonStop Kernel operating system network that extends the concept
of fault-tolerant operation to networks of geographically distributed NonStop systems. If
the network is properly designed, communication paths are constantly available even if
there is a single line failure or component failure.
Expand node. A system in an Expand network. See also node.
Expand node number. A number in the range 0 through 254, sometimes referred to as the
system number. The Expand node number is used to identify a node in an Expand
network. Each Expand node number must be unique within the network. See also
ServerNet node number.
Expand-over-ServerNet line. The single line associated with an Expand-over-ServerNet
line-handler process. An Expand-over-ServerNet line has the same name and logical
device number as its Expand-over-ServerNet line-handler process. However, it does
not have the same states as the line-handler process.
Expand-over-ServerNet line-handler process (Expand/SvNet). An Expand line-handler
process that uses the NETNAM protocol to access the network access method (NAM)
interface provided by the ServerNet monitor process, $ZZSCL. The
Expand-over-ServerNet line-handler process handles incoming and outgoing Expand
messages. It also handles packets leaving the server and security-related messages
going between systems within the cluster. Each node in a ServerNet cluster must be
configured with an Expand-over-ServerNet line-handler process for each other node in
the ServerNet cluster.
extensible input/output (XIO). A redesign of the NonStop Kernel operating system’s I/O
subsystem to enable it to extend itself in general ways to meet future requirements.
external fabric connection. The low-level ServerNet connection between a node and one
of the external ServerNet fabrics. Each node has an X and a Y connection to the
external fabrics.
external routing. The routing of packets over the external ServerNet fabrics—that is,
between systems (or nodes) in a ServerNet cluster. See also internal routing
.
external ServerNet X or Y fabric. The X or Y fabric that links servers in a ServerNet
cluster. See also internal ServerNet X or Y fabric
.
external system area network manager process (SANMAN). (1) A process that provides
management access to the external ServerNet X and Y fabrics.
fabric. A complex set of interconnections through which there can be multiple and (to the
user) unknown paths from point to point. The term fabric is used to refer to the X or Y
portion of the ServerNet communications network; for example, the X fabric.
factory-installed operating system. The version of the operating system image that HP
creates with a CONFTEXT file, OSIMAGE file, and configuration database that