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23-5
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-6965-03, Cisco MDS SAN-OS Release 2.x
Chapter 23 Configuring Intelligent Storage Services
SCSI Flow Statistics
Configuring Fibre Channel Write Acceleration
A SCSI flow is created when you configure Fibre Channel write acceleration. The SCSI flow consists of
the following attributes:
• SCSI flow identifier
• VSAN identifier
• SCSI initiator port WWN
• SCSI target port WWN
To configure Fibre Channel write acceleration on Fabric Manager, and optionally modify the number of
write acceleration buffers, follow these steps:
Step 1 Choose Switches > End Devices > SSM Features from the Physical Attributes pane. You see the
Intelligent Storage Services configuration in the Information pane, showing the FCWA tab.
Step 2 Click the Create Row button in the Information pane to create a SCSI flow or click a row in the FCWA
table to modify an existing SCSI flow. You see the Fibre Channel write acceleration dialog box.
Step 3 Select the initiator and target WWNs and VSAN IDs and check the WriteAcc check box to enable Fibre
Channel write acceleration on this SCSI flow. You can optionally enable SCSI flow statistics on this
SCSI flow at this time by checking the Enable Statistics check box.
Step 4 Optionally, set the BufCount value to set the number of 2K buffers used by the SCSI target.
Step 5 Click Create to create this SCSI flow with Fibre Channel write acceleration or click Cancel to discard
all changes.
SCSI Flow Statistics
The statistics that can be collected for SCSI flows include SCSI reads and writes, SCSI commands, and
errors. To take advantage of this feature, only the initiator must be directly attached to an SSM.
Note SCSI flow statistics requires that the Enterprise Package license be installed only on the initiator
switches.
Note For SCSI flow statistics, the initiator must connect to an SSM on a Cisco MDS switch while the target
can connect to any other switch in the fabric. The SCSI flow initiator and target cannot connect to the
same switch.