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23-3
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 Services
Disabling Intelligent Storage Services
To disable Intelligent Storage Services in Fabric Manager for an SSM and free up a group of ports that
used these services, follow these steps:
Step 1 Choose End Devices > SSM Features in the Physical Attributes pane. You see the Intelligent Storage
Services configuration in the Information pane.
Step 2 Click the SSM tab. You see the set of configured services in the Information pane.
Step 3 Select the row in the table that you want to disable.
Step 4 Check the Reboot Card on Delete check box if you want to force the card to reboot after disabling the
service. This is equivalent to the CLI force option.
Step 5 Click the Delete Row icon to delete this row. The ports that were provisioned for this service become
available for provisioning in another service.
Note If Reboot Card on Delete was checked, then the SSM module reboots.
SCSI Flow Services
A SCSI flow is a SCSI initiator/target combination. SCSI Flow Services provides enhanced features for
SCSI flows such as write acceleration and flow monitor for statistics gathering on an SSM. SCSI flows
can exist between an initiator/target combination on one SSM, or between two SSMs on different Cisco
MDS switches.
Note For statistics monitoring, the target device is not required to be connected to an SSM.
The SCSI flow manager resides on a supervisor module and handles the configuration of SCSI flows,
validating them and relaying configuration information to the appropriate SSM. It also handles any
dynamic changes to the status of the SCSI flow due to external events. The SCSI flow manager registers
events resulting from operations, such as port up or down, VSAN suspension, and zoning that affects the
SCSI flow status, and updates the flow status and configuration accordingly.
The SCSI flow manager on the initiator communicates to its peer on the target side using Cisco Fabric
Services (CFS). Peer communication allows the initiator SCSI flow manager to validate target
parameters and program information on the target side.
Fabric Manager creates SCSI flows when Fibre Channel write acceleration or SCSI flow statistics
gathering is configured.