Last updated: 98-07-30

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and XA are registered trademarks of Stratus Computer, Inc.

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Stratus Computer, Inc.


    PUBLICATIONS module_recovery.doc FILE
    Copyright (C) 1998 by Stratus Computer, Inc.


    Diagnosing and Recovering from VOS Hangs

This document describes how to diagnose and recover from situations in
which VOS hangs. It contains the following sections.

 1. Introduction
 2. Diagnosing and Recovering from a VOS Hang
  2.1. Recognizing System Activity
   2.1.1. Symptoms of Looping Processes
   2.1.2. Symptoms of a Hung or Busy TheOverseer Process
   2.1.3. Symptoms of a Module That Is Impaired but Not Hung
   2.1.4. Symptoms of a Hung Module
  2.2. Diagnosing a System Hang
  2.3. Recovery
 3. Notes          


The information in this document applies to all XA-series (Motorola 68000
architecture) and XA/R-series (Intel i860 architecture) modules.  For
information about recovering from VOS hangs on Continuum-series modules,
see the "Software Release Bulletin:  VOS Release 13.4.0" (R119), or contact
the Customer Assistance Center (CAC). 

 NOTE:  You should contact the CAC before attempting to perform these
 procedures.