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21-1
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-8007-01, Cisco Fabric Manager Release 3.x
21
Configuring the SAN Extension Tuner
The SAN extension tuner is unique to the Cisco MDS 9000 Family of switches. This feature helps you
optimize FCIP performance by generating SCSI I/O commands and directing such traffic to a specific
virtual target. You can specify the size of the test I/O transfers and how many concurrent I/Os to generate
while testing. The SAN extension tuner reports the resulting I/Os per second (IOPS) and I/O latency,
which helps you determine the number of concurrent I/Os needed to maximize FCIP throughput.
This chapter includes the following sections:
•About the SAN Extension Tuner, page 21-1
•Prerequisites, page 21-2
•Using the SAN Extension Tuner Wizard, page 21-3
About the SAN Extension Tuner
Applications such as remote copy and data backup use FCIP over an IP network to connect across
geographically distributed SANs. To achieve maximum throughput performance across the fabric, you
can tune the following configuration parameters:
•The TCP parameters for the FCIP profile.
•The number of concurrent SCSI I/Os generated by the application.
•The transfer size used by the application over an FCIP link.
SAN extension tuner is implemented in IPS ports. This feature can generate SCSI I/O commands (read
and write) to the virtual target based on your configured options (see Figure 21-1).