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

Topologies
HP NonStop S-Series Planning and Configuration Guide—523303-015
3-14
ServerNet Topology Configuration
ServerNet Topology Configuration
A ServerNet topology configuration is a value that determines how the CRUs
containing ServerNet routers (all PMF CRUs, IOMF CRUs, and SEBs, and MSEBs)
are configured.
Each NonStop S-series system has two separate ServerNet topology configuration
attributes:
Where the ServerNet Topology Configuration Value Is Stored
The ServerNet topology is determined by the primary SP in each enclosure. The
ServerNet topology configuration value is not stored in only one place within a system.
Instead, this value is stored within each system enclosure, in one of these locations:
•
In the file system of both PMF CRUs or IOMF CRUs
•
In the SEEROMs (SP firmware release T1089ANN and later)
This distributed storage can make it difficult to ascertain the ServerNet topology
configuration of an entire system, especially on a system where the ServerNet
topology configuration value varies from CRU to CRU.
OSM, like TSM product versions 7.0 and later, reports when a system has inconsistent
ServerNet topology configuration values. These product versions of OSM or TSM
report a system’s topology attribute as either 8, 16, or ERROR, where ERROR
indicates that at least one CRU has a ServerNet topology configuration value that is
different from that of the rest of the system.
In the outer tetrahedron, groups 05 through 08:
Processor enclosure slots 51 and 52 always
contain SEBs or MSEBs. These SEBs or
MSEBs maintain ServerNet connections
between the processor enclosure on the outer
tetrahedron and its associated processor
enclosure on the inner tetrahedron. Only one
ServerNet connector on each SEBs or
MSEBs is used for this purpose.
The SEBs or MSEBs in slots 51 and 52
have four connectors available to support
I/O enclosures.
Processor enclosure slots 53 and 54 can
contain only ServerNet adapters.
SEBs or MSEBs could be installed in slots
53 and 54 to attach additional I/O
enclosures, but these configurations are
not supported.
Topology Indicates the current ServerNet topology configuration
Topology after
next power cycle
Indicates the settings for the ServerNet topology configuration to
be used the next time the ServerNet routers are configured
Feature Implications (page 2 of 2)