NonStop S-Series Planning and Configuration Guide (G06.25+)

Topologies
HP NonStop S-Series Planning and Configuration Guide—523303-015
3-13
Tetra 8 Topology Features
Tetra 8 Topology Features
Tetra 16 Topology Features
Feature Implications
Up to four processor enclosures are
supported.
Expansion beyond four processor enclosures
requires a topology change.
Each processor enclosure can support up to
two I/O enclosures.
Expansion beyond eight I/O enclosures
requires a topology change.
Processor enclosure slots 51 and 52 can
contain SEBs or MSEBs. These SEBs or
MSEBs support I/O enclosures.
I/O enclosures multiply the number of
available adapter slots.
Processor enclosure slots 53 and 54 can
contain ServerNet adapters.
If you need more adapter slots, add I/O
enclosures.
An IOAM enclosure can replace any group
01 I/O enclosure of a NonStop S7600
system or later
Refer to IOAM Enclosures
on page 4-69.
Feature Implications (page 1 of 2)
Up to eight processor enclosures are
supported.
Adding processor enclosures does not
require a topology change.
Each processor enclosure supports:
Five I/O enclosures in the inner tetrahedron
Four I/O enclosures in the outer tetrahedron
Adding I/O enclosures does not require a
topology change.
An IOAM enclosure can replace any group 01
I/O enclosure of a NonStop S7600 system or
later
Refer to IOAM Enclosures
on page 4-69.
In the inner tetrahedron, groups 01 through 04:
Processor enclosure slots 51 and 52 always
contain SEBs or MSEBs. These SEBs or
MSEBs maintain ServerNet connections
among all processor enclosures in the inner
tetrahedron.
All the ServerNet connectors on these
SEBs or MSEBs are needed for
maintaining ServerNet connections among
processor enclosures.
Therefore, the SEBs or MSEBs in slots 51
and 52 are not available for supporting I/O
enclosures.
Processor enclosure slots 53 and 54 can
contain SEBs, MSEBs, or ServerNet
adapters. These SEBs or MSEBs support I/O
enclosures.
You can install ServerNet adapters in slots
53 and 54 of any processor enclosure in
the inner tetrahedron. However, if you do
this, you cannot attach I/O enclosures to
that processor enclosure.