Availability Guide for Problem Management

Problem Management Tools

Availability Guide for Problem Management–125509

9-25

NonStop Virtual Hometerm Subsystem (VHS)

The NonStop Virtual Hometerm Subsystem (VHS) acts as a virtual home terminal for

applications by emulating a 6530 terminal.

VHS receives messages normally sent to the home terminal, such as displays,

application prompts, COBOL run-time library errors, and Inspect or Debug prompts.

VHS uses these messages to generate event messages to the Event Management Service

(EMS) collector to inform operations staff of problems.

How VHS Works

VHS works with management applications, or it can be run directly from the TACL

prompt. You can have all of the messages from VHS included in EMS events and sent to

the EMS collector.

The VHS subsystem has two key files: the prompt file and the primary log file. VHS

stores application prompt messages in its prompt file and stores all messages it receives

in its primary log file. VHS sends event messages to the EMS collector and optionally to

a console facility for display messages only.

You configure your applications to send home terminal messages to VHS. If your

applications go into Inspect or Debug, VHS tries to save as much relevant information as

possible and stops the application.

Figure 9-8 illustrates the VHS architecture.