ServerNet Cluster Manual

ServerNet Cluster Description

ServerNet Cluster Manual—520575-003

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Node

When a system joins a network, the system becomes a network node. A node is a

uniquely identified computer system connected to one or more other computer

systems. Each system in an Expand network is an Expand node. Each system in a

ServerNet cluster is a ServerNet node. In general, a ServerNet node can be any model

of server that supports ServerNet fabrics. To determine if your server can be part of a

ServerNet cluster, refer to the documentation for your server. Because ServerNet

clusters use Expand, a ServerNet node is also an Expand node.

Node Number

NonStop servers use several types of node numbers. A node number identifies a

member system in a network. The node number is unique for each system in the

network.

A ServerNet node number identifies a member system in a ServerNet cluster. The

ServerNet node number is a simplified expression of the six-bit node routing ID that

determines the node to which a ServerNet packet is routed. The ServerNet node

number, which can be viewed using the OSM Service Connection, TSM Service

Application, or SCF, is unique for each node in a ServerNet cluster.

ServerNet Node-Number Assignments

The following table shows the ServerNet node numbers supported by each network

topology:

ServerNet node numbers are assigned automatically, depending on the port to which a

node is connected on the ServerNet II Switch. (The ServerNet II Switch is the main

component of a cluster switch.)

The cluster switches support the following ServerNet nodes:

This

Topology...

Supports ServerNet

Node Numbers...

Star 1 through 8

Split-star 1 through 16

Tri-star 1 through 24

Cluster

Switches...

Support ServerNet

Nodes...

X1 and Y1 1 through 8

X2 and Y2 9 through 16

X3 and Y3 17 through 24