ServerNet Cluster Web

What is a ServerNet Cluster?
The HP NonStop™ ServerNet Cluster product is an interconnection
technology for NonStop S-series servers. This technology enables multiple
servers to be connected in a group, or ServerNet cluster. A server or "node"
in the cluster can communicate with any other server in the cluster using
the ServerNet protocol.
ServerNet clusters extend the ServerNet X and Y fabrics outside the system
boundary and allow the ServerNet protocol to be used for intersystem
messaging. A ServerNet cluster consists of individual servers, each
containing internal ServerNet X and Y fabrics, connected through fiber-optic
cables and cluster switches to other servers. The fiber-optic cables and
cluster switches constitute external ServerNet X and Y fabrics.
ServerNet clusters allow multiple multiprocessor systems to work together
and appear to client applications as one large processing entity. Only
NonStop S-series servers can belong to a ServerNet cluster. (NonStop
K-series servers do not use the ServerNet protocol.) S-series servers using
either the Tetra 8 or Tetra 16 topologies can participate in a cluster.
There are two main types of ServerNet clusters--clusters that use the star
topologies (star, split-star, and tri-star), and clusters that use the layered
topology.
Star Topologies
The star topologies are built with the HP NonStop Cluster Switch (model
6770), formerly called the Compaq NonStop Himalaya Cluster Switch. The
star topology supports up to 8 nodes, the split-star topology supports up to
16 nodes, and the tri-star supports up to 24 nodes. For details about the
different star topologies, see the ServerNet Cluster Manual.
Layered Topology
The layered topology is built with the HP NonStop ServerNet Switch (model
6780). The layered topology supports up to 64 nodes and is generally
available with the G06.22 RVU. For details about the layered topology, see
the ServerNet Cluster 6780 Planning and Installation Guide.