Introduction
Tape drives are getting faster and it
is not always easy to make the most of their performance in complex
systems. Debugging performance problems can be tricky at the best of
times.
This document aims to provide the knowledge
and tools to help identify where performance related problems lie in a
tape backup system and gives guidance on how they can be fixed.
Note that this guide applies equally to
backup systems whatever type of tape drive is used. However, the
examples used refer to HP's Ultrium and SDLT tape drives, as these are
the fastest and most challenging to configure correctly. 
Figure 1: Example topology
Performance Troubleshooting Guide (guide to solving performance issues)
This guide is aimed at troubleshooting
performance issues. For example, the backup or restore is working
functionally, just not as fast as expected. If the backup is not working
at all, then take a look at the Basic Troubleshooting Guide
first.
This guide is ordered so that the most
likely issues are discussed first. It is recommended that this order is
followed when troubleshooting performance issues.
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