ServerNet Cluster Web

Cluster Size
How many nodes are supported in a ServerNet cluster? Up to 24 nodes are
supported for the tri-star topology. Up to 64 nodes are supported for the layered
topology.
Will larger clusters be supported in future releases? Possibly. The ServerNet
cluster architecture can theoretically support 1,024 nodes. However, ServerNet
clustering relies on Expand, which currently supports no more than 255 nodes.
Is it possible to have a one-node cluster? Yes. It is possible to configure a
single system so that the software necessary for external ServerNet communication
(SNETMON/MSGMON and SANMAN) is running and ready to communicate with other
nodes. However, if no other nodes are connected to the cluster switches, no
communication will occur. In this case, communication with remote nodes will occur
as soon as the nodes are configured and connected.
Can multiple clusters be connected to enable communication between the
clusters? Yes, a node in one cluster can be connected to a node in another cluster
using any of the HP LAN or WAN solutions (Ethernet, Token Ring, ATM, and so on).
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Coexistence
Can a ServerNet cluster be combined with other types of Expand networks?
Yes. Nodes in a ServerNet cluster coexist as systems belonging to an Expand
network and therefore are compatible with other Expand nodes. A node in a
ServerNet cluster can simultaneously function as a node in a FOX ring, an ATM
network, an Ethernet LAN, or other type of Expand transport.
Support Note S00068 and the Expand Configuration and Management Manual show
examples of integrated Expand networks, including ServerNet clusters coexisting
with FOX rings and ServerNet clusters linked by ATM or IP lines. This support note
also offers considerations for configuring Expand networks that include ServerNet
clusters.
Will ServerNet clusters coexist with Windows NT clusters? Coexistence with
Windows NT clusters is not supported.
Will I have to make changes to my applications in order to use a ServerNet
cluster? No.
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Definitions
What is a ServerNet cluster? A ServerNet cluster is a network of NonStop™
S-series servers connected using the ServerNet protocol, and sharing a common
transport for interprocessor communication across and within a cluster. ServerNet
clusters offer fast end-to-end communication without intermediate protocol stacks,
achieving comparable speeds for internal and external ServerNet fabric
communication.
What is a node? A node is a uniquely identified computer system connected to one