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

6 Communications Subsystems: Monitoring and Recovery
• “When to Use This Section” (page 77)
• “Communications Subsystems” (page 77)
— “Local Area Networks (LANs) and Wide Area Networks (WANs)” (page 77)
“Monitoring Communications Subsystems and Their Objects” (page 79)
• “Monitoring the SLSA Subsystem” (page 79)
• “Monitoring the WAN Subsystem” (page 81)
• “Monitoring the NonStop TCP/IP Subsystem” (page 84)
• “Monitoring Line-Handler Process Status” (page 85)
• “Tracing a Communications Line” (page 87)
• “Recovery Operations for Communications Subsystems ” (page 87)
• “Related Reading” (page 87)
When to Use This Section
Use this section to determine where to find more information about monitoring and recovery
operations for communications devices such as ServerNet adapters, printers, and spoolers;
communications lines; and communications processes such as WAN IOPs.
Communications Subsystems
The software that provides users of Integrity NonStop systems with access to a set of
communications services is called a communications subsystem. Because connectivity is an
important part of online transaction processing (OLTP), HP offers a variety of communications
products that support a wide range of applications.
Communication between specific devices or networks is typically achieved using several
communications products or subsystems. These products are related as components in a layered
structure. To accomplish the required connection, higher-level components—for example,
NonStop TCP/IP processes—use the services of lower-level components such as the ServerNet
LAN Systems Access (SLSA) subsystem.
The same higher-level component can often use any of several lower-level components; thus,
the Expand subsystem—which consists of multiple processes on a node—can use the NonStop
TCP/IP subsystem, the X.25 Access Method (X.25 AM), or other communication interface options
to provide data transmissions over local area networks (LANs) or wide area networks (WANs),
respectively. Similarly, multiple higher-level components can use the services of a single
lower-level component.
Local Area Networks (LANs) and Wide Area Networks (WANs)
Two important communications interfaces for LANs and WANs on Integrity NonStop servers
are the SLSA subsystem and the WAN subsystem.
The SLSA subsystem supports parallel LAN I/O operations, allowing Integrity NonStop NS-series
servers to communicate across the ServerNet fabrics and access Ethernet devices through various
LAN protocols. SLSA also communicates with the appropriate adapter type over the ServerNet
fabrics. Adapters supported on Integrity NonStop systems include:
• Gigabit Ethernet 4-port adapter (G4SA)
• Fibre Channel ServerNet adapter (FCSA) (for the Storage subsystem)
I/O adapter module (IOAM) enclosures enable I/O operations to take place between Integrity
NonStop servers and some Fibre Channel storage devices. See the Modular I/O Installation and
Configuration Guide for more information.
When to Use This Section 77