NonStop S-Series Planning and Configuration Guide (G06.26+)

Enclosure Arrangements and Cable Connections
HP NonStop S-Series Planning and Configuration Guide—523303-017
7-13
Considerations for Expanding a System
Considerations for Expanding a System
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NonStop S7xx servers are limited to two processors.
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NonStop S-series servers can grow from two to 16 processors, in pairs. The more
processors a system has, the more I/O enclosures it can have.
For more information about which systems support which topologies, and how
many enclosures are supported by each system, refer to Section 3, Topologies.
•
For information about changing the system configuration, refer to Section 9, The
Planning and Configuration Process, and Section 13, Completing the Installation
Plan.
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You select the topology of a system at the time you order the system. You cannot
change the topology online. You can change the topology of a system using the
OSM or TSM package, but you must bring down the system and change some
cable connections.
For information about changing the system topology, see Changing the System
Topology on page 15-2.
•
You should establish the inner tetrahedron on a system before you establish the
outer tetrahedron. For more information, refer to Tetra 16 Topology on page 3-5.
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When you add I/O enclosures to a system, you should balance them evenly across
processor enclosures; that is, every processor enclosure in the system should
have one I/O enclosure attached to it before any processor enclosure has two I/O
enclosures attached to it.
The first I/O enclosure connected to a processor enclosure has a group number
that ends in 1 (11, 21, 31, and so forth, where the first digit is the group number of
the processor enclosure it is connected to).
The second I/O enclosure connected to a processor enclosure has a group
number that ends in 2 (12, 22, 32, and so forth).
If the topology allows it, third, fourth, and fifth I/O enclosures can then be
connected to a processor enclosure. Those I/O enclosures have group numbers
that end in 3, 4, and 5, respectively.