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Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
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Troubleshooting Overview
This chapter introduces the basic concepts, methodology, and general troubleshooting guidelines for
problems that may occur when configuring and using the Cisco MDS 9000 Family of multilayer
directors and fabric switches.
This chapter includes the following sections:
• Overview of the Troubleshooting Process, page 1-1
• Best Practices, page 1-2
• Troubleshooting Basics, page 1-2
• Primary Troubleshooting Flowchart, page 1-9
• System Messages, page 1-10
• Troubleshooting with Logs, page 1-13
• Contacting Customer Support, page 1-15
Overview of the Troubleshooting Process
To troubleshoot your fabric environment, follow these general steps:
Step 1 Gather information that defines the specific symptoms.
Step 2 Identify all potential problems that could be causing the symptoms.
Step 3 Systematically eliminate each potential problem (from most likely to least likely) until the symptoms
disappear.
To identify the possible problems, you need to use a variety of tools and understand the overall storage
environment. For this reason, this guide describes a number of general troubleshooting tools in
Appendix B, “Troubleshooting Tools and Methodology,” including those that are specific to the Cisco
MDS 9000 Family. This chapter also provides a plan for investigating storage issues. See other chapters
in this book for detailed explanations of specific issues.
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