HP NonStop NS manual Communications Subsystems Monitoring and Recovery

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Communications Subsystems: Monitoring and Recovery

When to Use This Section on page 6-1

Communications Subsystems on page 6-1

Local Area Networks (LANs) and Wide Area Networks (WANs) on page 6-2

Monitoring Communications Subsystems and Their Objects on page 6-4

Monitoring the SLSA Subsystem on page 6-4

Monitoring the WAN Subsystem on page 6-6

Monitoring the NonStop TCP/IP Subsystem on page 6-9

Monitoring Line-Handler Process Status on page 6-10

Tracing a Communications Line on page 6-12

Recovery Operations for Communications Subsystems on page 6-13

Related Reading on page 6-13

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),

HP Integrity NonStop NS-Series Operations Guide—529869-005

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