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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 .
To specify a transfer ready size for a SCSI write command, follow these steps:
Command
Step 1
switch# san-ext-tuner
switch(san-ext)#
Step 2
switch(san-ext)# nWWN 10:00:00:00:00:00:00:00
Step 3
switch(san-ext)# nport pWWN
12:00:00:00:00:00:00:56 vsan 200 interface
gigabitethernet 3/4
switch(san-ext-nport)#
Step 4
switch(san-ext-nport)# write command-id 100
target 22:22:22:22:22:22:22:22 transfer-size
512000 outstanding-ios 2 num-transactions
5000000
Step 5
switch(san-ext-nport)# transfer-ready-size
512000
switch(san-ext-nport)# no transfer-ready-size
512000
Step 6
switch(san-ext-nport)# stop command-id 100
Step 7
switch(san-ext-nport)# end
switch#
Data Pattern
By default, an all-zero pattern is used as the pattern for data generated by the virtual N ports. You can
optionally specify a file as the data pattern to be generated by selecting a data pattern file from one of
three locations: the bootflash: directory, the volatile: directory, or the slot0: directory. This option is
especially useful when testing compression over FCIP links. You can also use Canterbury corpus or
artificial corpus files for benchmarking purposes.
To optionally configure a data pattern for SCSI commands, follow these steps:
Command
Step 1
switch# san-ext-tuner
switch(san-ext)#
Step 2
switch(san-ext)# nport pWWN
12:00:00:00:00:00:00:56 vsan 200 interface
gigabitethernet 3/4
switch(san-ext-nport)#
Step 3
switch(san-ext-nport)# data-pattern-file
bootflash://DataPatternFile
switch(san-ext-nport)# no data-pattern-file
OL-6973-03, Cisco MDS SAN-OS Release 2.x
Purpose
Enters the SET configuration submode.
Configures the nWWN for the SAN
extension tuner.
Creates a virtual N port on the specified
Gigabit Ethernet port and VSAN. This N port
can act as a initiator or a target.
Specifies a transfer size of 512,000 bytes
with two outstanding I/Os in the write
command received by the target. The total
number of I/Os is 5,000,000 bytes.
Specifies the maximum transfer ready size of
512,000 bytes as a target for SCSI write
commands. For a SCSI write command with
a larger size, the target performs multiple
transfers based on the specified transfer size.
Removes the specified transfer ready size
configuration for SCSI write commands.
Stops the command with the specified ID.
Exits the SAN extension tuner submode.
Purpose
Enters the SET configuration submode.
Creates a virtual N port on the specified Gigabit
Ethernet port and VSAN. This N port can act as
a initiator or a target.
Specifies the data pattern used by the N port to
generate data as a target for read commands
and initiator for write commands.
Removes the specified transfer ready size
configuration for SCSI write commands and
defaults to using the all-zero pattern.
Cisco MDS 9000 Family Configuration Guide
Data Pattern
34-7
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