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Cisco MDS 9000 Family Troubleshooting Guide
OL-5183-02, Cisco MDS SAN-OS Release 1.3
Chapter 1 Troubleshooting Overview
Using Cisco MDS 9000 Family Tools
http://sourceforge.net/projects/iometer/
Iometer is not the only I/O generator you can use to simulate traffic through the SAN fabric. Other
popular I/O generators and benchmark tools used for SAN testing include Iozone and Postmark. Iozone
is a file system benchmark tool that generates and measures a variety of file operations. It has been
ported to many systems and is useful for performing a broad range of file system tests and analysis.
Postmark was designed to create a large pool of continually changing files, which simulates the
transaction rates of a large Internet mail server.
PostMark generates an initial pool of random text files in a configurable range of sizes. Creation of the
pool produces statistics on continuous small file creation performance. Once the pool is created,
PostMark generates a specified number of transactions, each of which consists of a pair of smaller
transactions:
• Create file or Delete file
• Read file or Append file
Benchmark is available from Network Appliance, Inc. at the following URL:
http://www.netapp.com/tech_library/3022.html
Benchmarking tools offer a variety of capabilities and you should select the one that provides the best
I/O characteristics of your application environment.
Utilities provided by the Sun Solaris operating system let you determine if the remote storage has been
recognized and exported to you in form of a raw device or mounted file system, and to issue some basic
queries and tests to the storage. You can measure performance and generate loads using the iostat utility,
the perfmeter GUI utility, the dd utility, or a third-party utility like Extreme SCSI.
Every UNIX version provides similar utilities, but this guide only provides examples for Solaris. Refer
to the documentation for your specific operating system for details.
Using Cisco MDS 9000 Family Tools
If the server does not see its storage and you cannot use the information available on the host side to
determine the root cause of the problem, you can obtain additional information from a different
viewpoint using the troubleshooting tools provided with the Cisco MDS 9000 family of switches. This
section introduces these tools and describes the kinds of problems for which you can use each tool. It
includes the following topics:
• Command-Line-Interface (CLI), page 1-5
• CLI Debug, page 1-5
• FC Ping and FC Traceroute, page 1-7
• Cisco Fabric Manager, page 1-9
• SCSI Target Discovery, page 1-13
• SNMP and RMON Support, page 1-14
• Using RADIUS, page 1-15
• Using Syslog, page 1-16
• Using Fibre Channel SPAN, page 1-16
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