ServerNet Cluster 6780 Planning and Installation Guide (G06.24+, H06.03+)

Glossary
ServerNet Cluster 6780 Planning and Installation Guide—527301-004
Glossary-8
Expand line-handler process
Expand line-handler process. A process pair that handles incoming and outgoing Expand
messages and packets. An Expand line-handler process handles direct links and also
binds to other processes using the Network Access Method (NAM) interface to support
Expand-over-X.25, Expand-over-FOX, Expand-over-ServerNet, Expand-over-TCP/IP,
and Expand-over-SNA links. See also Expand-over-ServerNet line-handler process
(Expand/SvNet).
Expand network. The HP NonStop™ 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 HP NonStop™ operating system 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 fabrics. The fabrics that link systems in a ServerNet cluster. See also
internal ServerNet fabric.
external system area network manager process (SANMAN). (1) A process that provides
management access to the external ServerNet X and Y fabrics.