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49-1
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
49
Configuring the SAN Extension Tuner
The SAN Extension Tuner (SET) feature is unique to the Cisco MDS 9000 Family of switches. This
feature helps you optimize FCIP performance by generating either direct access (magnetic disk) or
sequential access (magnetic tape) 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 or serial I/Os to
generate while testing. The SET 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 49-1
• License Prerequisites, page 49-3
• Configuring the SAN Extension Tuner, page 49-3
• Using the SAN Extension Tuner Wizard, page 49-4
• Default Settings, page 49-7
About the SAN Extension Tuner
Note SAN Extension Tuner is not supported on the Cisco Fabric Switch for HP c-Class BladeSystem and the
Cisco Fabric Switch for IBM BladeCenter.
Note As of Cisco MDS SAN-OS Release 3.3(1a), SAN Extension Tuner is supported on the Multiservice
Module (MSM) and the Multiservice Modular Switch.
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 (see the “Window Management” section on page 48-20).
• The number of concurrent SCSI I/Os generated by the application.
• The transfer size used by the application over an FCIP link.
SET is implemented in IPS ports. When enabled, this feature can be used to generate SCSI I/O
commands (read and write) to the virtual target based on your configured options (see Figure 49-1).
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