TFDS Manual

Tandem Failure Data System (TFDS) Manual—520628-003
2-1
2 Using TFDS
This section covers the following topics:
TFDS Components
How TFDS Works
This TFDS operational model describes how TFDS components typically work together
and with other system resources to perform failure data collection and recovery
services. The steps are numbered to match the accompanying Figure 2-1
.
1. TFDS monitors processors, listening for software failure notifications. These
notifications include:
•
CPU DOWN messages.
TFDS Components on page 2-1
How TFDS Works on page 2-1
When to Use TFDS on page 2-3
System Resource Usage on page 2-3
Monitoring TFDS Status on page 2-4
What to Do After a Software Failure on page 2-6
Component Description
TFDS monitor A process pair that constantly watches system messages for
notification of software-related processor halts or software
failure. (TFDS takes no processor time for this monitoring. It is
awakened only when action is necessary.)
TFDSCOM The user interface that allows you to change configuration
parameters and perform actions.
Rediscovery
engine
The engine that performs data collection and processor
reloads as necessary.
TFDS run-time
library (TFDRTL)
The library that processes software instrumentation calls
embedded in NonStop Kernel subsystem software to indicate
internal software failure.
Note. TFDS should be disabled when any use of the unsupported product called
DIVER is taking place. DIVER is an old program and does not correctly simulate the
software halting of a processor. To simulate the halting of a processor for testing
purposes, use the HP TSM Low-Level Link Application and click the Processor Status
button, followed by the processor selection HALT as the processor action and perform
action. TFDS ignores this halt unless the IGNOREOPERATORHALTS option is turned
OFF. With this option off, TFDS processes this halt in the same way as a normal
software halt.