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Chapter 34
Configuring the SAN Extension Tuner
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 .
Tuner Guidelines
Before tuning the SAN fabric, be aware of the following guidelines:
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Tuner Initialization
The tuning feature is disabled by default in all switches in the Cisco 9000 Family. When you enable this
feature, tuning is globally enabled for the entire switch.
To enable the tuning feature, follow these steps:
Command
Step 1
switch# config t
Step 2
switch(config)# san-ext-tuner enable
switch(config)# no san-ext-tuner
enable
Tuner Configuration
Figure 34-2
not a part of the FCIP link for which the throughput and latency is measured.
OL-6973-03, Cisco MDS SAN-OS Release 2.x
Be aware of the following implementation details:
The tuned configuration is not persistent.
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The virtual N ports created do not register FC4 features supported with the name server. This is
to avoid the hosts in the SAN from discovering these N ports as regular initiators or targets.
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Login requests from other initiators in the SAN are rejected.
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The virtual N ports do not implement the entire SCSI suite, it only implements the SCSI read
and write commands.
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Tuner initiators can only communicate with tuner targets.
Verify that the Gigabit Ethernet interface is up at the physical layer (GBIC and Cable connected—an
IP address is not required).
Enable iSCSI on the switch (no other iSCSI configuration is required).
Create an iSCSI interface on the Gigabit Ethernet interface and enable the interface (no other iSCSI
interface configuration is required) (see the
Configure the virtual N ports in a separate VSAN or zone as required by your network.
Be aware that a separate VSAN with only virtual N ports is not required, but is recommended as
some legacy HBAs may fail if logins to targets are rejected.
Do not use same Gigabit Ethernet interface to configure virtual N ports and FCIP links—use
different Gigabit Ethernet interfaces. While this is not a requirement, it is recommended as the
traffic generated by the virtual N ports may interfere with the performance of the FCIP link.
provides a sample physical setup in which the virtual N ports are created on ports that are
"Creating iSCSI Interfaces" section on page
Purpose
Enters configuration mode.
Enables tuning.
Removes the currently applied tuning configuration and
disables tuning (default).
Cisco MDS 9000 Family Configuration Guide
Tuner Guidelines
35-4).
34-3
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