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Chapter 38
Configuring SCSI Flow Services and Statistics
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 .
SCSI Flow Configuration Client
A SCSI flow configuration client (SFCC) resides on the CPP of the SSM. It receives flow configuration
requests from the SFM, programs the DPP corresponding to the initiator and target port interfaces, and
responds to the SFM with the status of the configuration request.
SCSI Flow Data Path Support
The DPP on the SSM examines all the messages between the initiator and target and provides SCSI flow
features such as Fibre Channel write acceleration and statistics monitoring.
Configuring SCSI Flow Services
A SCSI flow specification consists of the following attributes:
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The SCSI flow specification is a distributed configuration because the SCSI initiator and the target might
be physically connected to SSMs on two different switches located across the fabric. The configuration
does not require information to identify either the switch name or the SSM slot location for either the
initiator or the target. The manual SCSI flow configuration is performed only at the initiator side. This
simplifies the configuration process. The initiator switch sends the configuration to the SFM on the
target switch using CFS. No SCSI flow configuration is necessary on the target switch.
Enabling SCSI Flow Services
In Cisco MDS SAN-OS Releases 2.0(1b) through 2.1(1a), you can only enable SCSI flow services on
the entire SSM. As of Cisco MDS SAN-OS Release 2.1(2), you can enable SCSI flow services either on
the entire SSM or on groups of four interfaces.
Enabling SCSI flow services on interfaces has the following restrictions:
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Fibre Channel write acceleration can only be provisioned on the entire SSM, not a group of interfaces
Note
on the SSM.
OL-6973-03, Cisco MDS SAN-OS Release 2.x
SCSI flow identifier
VSAN identifier
SCSI initiator port WWN
SCSI target port WWN
Flow feature set consisting of Fibre Channel write acceleration and statistics monitoring.
The fewest number of interfaces which you can enable is four. You can specify fc1 through fc4 but
not fc1 through fc2.
The first interface in the group must be 1, 5, 9, 13, 17, 21, 25, or 29. You can specify fc5 through
fc8 but not fc7 through fc10.
The groups of four interfaces do not need to be consecutive. You can specify fc1 through fc8 and
fc17 through fc20.
Configuring SCSI Flow Services
Cisco MDS 9000 Family Configuration Guide
38-3
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