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Enabling Fibre Channel Write Acceleration
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 .
Enabling Fibre Channel Write Acceleration
To enable Fibre Channel write acceleration, and optionally modify the number of write acceleration
buffers, follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# ssm enable feature
scsi-flow module 2
Step 3
switch(config)# scsi-flow flow-id 3
initiator-vsan 2 initiator-pwwn
21:00:00:e0:8b:07:5f:aa target-vsan 4
target-pwwn 2a:20:00:05:30:00:77:e0
Step 4
switch(config)# scsi-flow flow-id 3
write-acceleration
switch(config)# no scsi-flow flow-id 3
write-acceleration
Step 5
switch(config)# scsi-flow flow-id 3
write-acceleration buffer 2048
switch(config)# no scsi-flow flow-id 3
write-acceleration buffer 1024
Displaying SCSI Flow Services Information
Use the show scsi-flow command to display information about the status of the Fibre Channel write
acceleration configuration (see
Example 39-1 Displays Fibre Channel Write Acceleration Configuration for All SCSI Flow Identifiers
switch# show scsi-flow
Flow Id: 3
Cisco MDS 9000 Family Configuration Guide
39-2
Example 39-1
Initiator VSAN: 101
Initiator WWN: 21:00:00:e0:8b:05:76:28
Target VSAN: 102
Target WWN: 21:00:00:20:37:38:7f:7d
Target LUN: ALL LUNs
Flow Verification Status:
-------------------------
Initiator Verification Status:
Target Verification Status:
Initiator Linecard Status:
Target Linecard Status:
Feature Status:
---------------
Write-Acceleration enabled
Write-Acceleration Buffers: 1024
Configuration Status:
Statistics enabled
Chapter 39
Configuring Fibre Channel Write Acceleration
Purpose
Enters configuration mode.
Enables SCSI flow services on the SSM in slot 2.
Fibre Channel write acceleration can only be
Note
configured on all interfaces on the SSM, not
on groups of interfaces.
Configures SCSI flow identifier 3 using the pWWNs
of the initiator and the target. The flow identifier
range is 1 to 65535.
Enables Fibre Channel write acceleration for SCSI
flow identifier 3.
Disables SCSI flow write acceleration for SCSI flow
identifier 3. The default is disabled.
Enables Fibre Channel write acceleration for SCSI
flow identifier 3 and sets the number of buffers to
2048. The range is 1 to 40000.
Reverts to the default number of write acceleration
buffers. The default is 1024.
and
Example
39-2).
success
success
success
success
success
OL-6973-03, Cisco MDS SAN-OS Release 2.x
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