NonStop Operations Guide for H-Series and J-Series RVUs

In the ServerNet architecture, each processor maintains two independent paths to other processors
and I/O devices. These dual paths can be used simultaneously to improve performance, and to
ensure that no single failure disrupts communications among the remaining system components.
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, such
as 6770 ServerNet clusters, 6780 ServerNet clusters, and BladeClusters) 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 (such as a 6770 ServerNet cluster, 6780
ServerNet cluster, or BladeCluster), 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 and the BladeCluster Solution Manual provide
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.
2. Expand the tree pane to locate and select the ServerNet fabric-related objects:
a. Internal ServerNet X and Y Fabric objects — for NonStop NS-series systems, they are
located under the Fabric Group object, but for NonStop BladeSystems they are located
at the top level under the System object.
b. ServerNet Switches — located under Enclosure 100 (and, optionally, Enclosure 101),
the switch in module 2, slot 5 is the X fabric switch for each enclosure, and the switch in
module 3, slot 7 is the Y fabric switch.
c. External ServerNet X and Y Fabric objects — located under the ServerNet Cluster object
(if your system is part of a ServerNet cluster).
102 ServerNet Resources: Monitoring and Recovery