NonStop NS-Series Operations Guide (H06.12+)

ServerNet cables connected to the p-switch PICs in slots 10 through 13 come from the LSUs and
processors. Cables connected to the PICs in slots 4 though 9 connect to one or more IOAM
enclosures or to NonStop S-series I/O enclosures equipped with IOMF2 CRUs. Figure 7-3 shows
the connections to the PICs in a fully populated p-switch.
For Integrity NonStop NS14000 systems, see “Integrity NonStop NS14000 ServerNet Connectivity”
(page 90). Like NS14000 systems, older Integrity NonStop NS1000 systems use 4PSEs installed
in IOAM enclosures to provide ServerNet connections between I/O devices and processors.
However, there are no LSUs; the 4PSEs connect directly to the Blade Elements. Newer NS14000
and NS1000 systems, and NS1200 systems use VIO enclosures for ServerNet connections. For
more information, see the appropriate Installation Manual or the Versatile I/O Manual.
Figure 7-3 I/O Connections to the PICS in a P-Switch
Monitoring the Status of the ServerNet Fabrics
The ServerNet fabrics provide the communication paths used for interprocessor messages, for
communication between processors and I/O devices, and (in the case of ServerNet clusters) for
communication between systems.The ServerNet fabrics consist of two entirely separate
communication paths—the X fabric and the Y fabric.
NOTE: If the system is a member of a ServerNet cluster, ServerNet connections to other members
are accomplished by extending the ServerNet fabrics outside the system. Such external connections
make up the external ServerNet fabrics. The ServerNet Cluster Manual provides additional
information about monitoring the external ServerNet fabrics.
To monitor the status of the ServerNet fabrics:
• Use the OSM Service Connection to check the communication between processor enclosures,
I/O enclosures, and systems.
• Use the Subsystem Control Facility (SCF) to check the status of interprocessor communication
on the X and Y fabrics.
Monitoring the ServerNet Fabrics Using OSM
To check the ServerNet fabrics:
1. Log on to the OSM Service Connection.
92 ServerNet Resources: Monitoring and Recovery