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

7 ServerNet Resources: Monitoring and Recovery
• “ServerNet Communications Network” (page 89)
• “System I/O ServerNet Connections” (page 91)
• “Monitoring the Status of the ServerNet Fabrics” (page 92)
— “Monitoring the ServerNet Fabrics Using OSM” (page 92)
— “Monitoring the ServerNet Fabrics Using SCF” (page 93)
• “Related Reading” (page 95)
When to Use This Section
Use this section to learn about monitoring and performing recovery operations for the internal
and external ServerNet fabrics, and to understand how and when an Integrity NonStop NS-series
system can be connected to legacy NonStop S-series I/O enclosures.
NOTE: Integrity NonStop NS16000 series systems support connectivity to NonStop S-series
I/O enclosures, Integrity NonStop NS14000, NS1200, and NS1000 systems do not. For more
information, see Differences Between Integrity NonStop NS-Series Systems on page 2-2.
An Integrity NonStop NS16000 series system can be part of the same ServerNet cluster as NonStop
S-series systems, an Integrity NonStop NS14000 system cannot be. For more information, see the
ServerNet Cluster Supplement for Integrity NonStop NS-Series Servers.
Integrity NonStop NS1200 and NS1000 systems do not support ServerNet clusters.
All Integrity NonStop system I/O is performed through the ServerNet system area network
(SAN). LSU logic boards connect the SAN to the replicated four-way microprocessors on Integrity
NonStop systems (except for Integrity NonStop NS1200 and NS1000 systems, which have no
LSUs; see “System I/O ServerNet Connections” (page 91)).
ServerNet Communications Network
The ServerNet communications network is a high-speed network within an Integrity NonStop
system that connects processors to each other and to peripheral controllers. This network offers
the connectivity of a standard network, but it does not depend on shared resources such as
interprocessor buses or I/O channels. Instead, the ServerNet communications network uses the
ServerNet architecture, which is wormhole-routed, full-duplex, packet-switched, and
point-to-point. This network offers low latency, low software overhead, high bandwidth, and
parallel operation.
In the ServerNet architecture, each processor maintains two independent paths to other processors,
I/O devices, and ServerNet adapters. These dual paths can be used simultaneously to improve
performance, and to ensure that no single failure disrupts communications among the remaining
system components.
A ServerNet adapter provides the interface between a ServerNet fabric and the Fibre Channel
and Ethernet links. A ServerNet adapter contains a ServerNet bus interface (SBI) and one or more
ServerNet addressable controllers (SACs).
Integrity NonStop NS16000 Series ServerNet Connectivity
An Integrity NonStop NS16000 series system uses the ServerNet fabric for interconnections
between the LSUs, p-switches, and IOAMs, enabling an Integrity NonStop system to be connected
to legacy NonStop S-series enclosures. Figure 7-1 shows a logical representation of a complete
system with the X and Y ServerNet fabrics.
When to Use This Section 89