Sun Microsystems Sun HPC 3.0, Руководство пользователя

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Notes for Switched Two-Node Network
In a switchless two-node network, one scrubber jumper must be ON and the other
must be OFF. In a three- or four-node network, all scrubber jumpers must be ON.
This means, if you add a node to a two-node network that was originally set up
without a switch, you must:
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add a switch to the network
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change the OFF scrubber jumper to ON and reboot that node
If, however, you configure the two-node network with a switch from the beginning,
you will initially set all scrubber jumpers to ON. As a result, the adapter cards will
be initialized to communicate through a switch from the beginning and it will not be
necessary to change any scrubber jumpers when you add nodes to the network.
If you plan to do this, read the instructions for creating three- and four-node
networks instead of the section on two-node networks.
Note - The chief disadvantage to using a switch when it is not required is that the
switch adds some latency that would otherwise not be in the network.
Notes Regarding SBus Slots
If the SCI adapter cards are not already installed in the nodes, install them in
available SBus slots. Refer to the hardware installation manual that was supplied
with your server for installation instructions.
It possible, apply the following guidelines when choosing which SBus slots to use:
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Install the cards in the lowest-numbered available SBus slots.
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If you are installing two adapter cards per node, locate them in adjacent SBus slots.
Adhering to these guidelines will make it easier for you to edit the SCI configuration
file,
sci_config.hpc
, later in the installation process. Chapter 3 explains how to
edit this file.
Connecting SCI Adapter Cards in a
Two-Node Network
This section explains how to create a two-node SCI network that does not use an SCI
switch.
1. Position the nodes in the desired locations.
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Sun HPC 3.0 SCI Guide
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June 1999, Revision A