Troubleshooting San Switching Issues; Overview - Cisco N5K-M1600 - Expansion Module - 6 Ports Troubleshooting Manual

S e n d d o c u m e n t c o m m e n t s t o n e x u s 5 k - d o c f e e d b a c k @ c i s c o . c o m .

Troubleshooting SAN Switching Issues

A storage area network (SAN) is a network of storage devices that provide data storage for servers.
This chapter describes how to identify and resolve problems that can occur with a SAN and the Cisco
Nexus 5000 Series switch.
This chapter includes the following sections:
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Overview

The two most common symptoms of problems in a storage network are:
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By answering the questions in this section, you can determine the paths you need to follow and the
components that you should investigate further. These questions are independent of host, switch, or
subsystem vendor.
Consider the following questions to determine the status of your installation:
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OL-25300-01
Overview
NPV
Zoning
SAN Port Channels
FC Services
Cisco Fabric Services
VSANs
Registers and Counters
A host cannot access its allocated storage.
An application does not respond after attempting to access the allocated storage.
Is this a newly installed system or an existing installation? (It could be a new SAN, host, or
subsystem, or new LUNs exported to an existing host.)
Has the host ever been able to see its storage?
Does the host recognize any LUNs in the subsystem?
Are you trying to solve an existing application problem (too slow, too high latency, excessively long
response time) or did the problem show up recently?
What changed in the configuration or in the overall infrastructure immediately before the
applications started to have problems?
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Cisco Nexus 5000 Series Troubleshooting Guide
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