S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
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
SAN Extension Tuner is not supported on the Cisco Fabric Switch for HP c-Class BladeSystem and the
Cisco Fabric Switch for IBM BladeCenter.
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:
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
OL-16184-01, Cisco MDS SAN-OS Release 3.x
About the SAN Extension Tuner, page 41-1
License Prerequisites, page 41-3
Configuring the SAN Extension Tuner, page 41-3
Verifying the SAN Extension Tuner Configuration, page 41-9
Default Settings, page 41-10
The TCP parameters for the FCIP profile (see the
The number of concurrent SCSI I/Os generated by the application.
The transfer size used by the application over an FCIP link.
C H A P T E R
"Window Management" section on page
Cisco MDS 9000 Family CLI Configuration Guide