> # Using the SAN Extension Tuner Wizard

> You can use the SAN Extension Tuner wizard to perform the these tasks:

> - Configuring nWWN ports
> - Enabling iSCSI
> - Configuring Virtual N ports
> - Assigning SCSI read and write CLI commands
> - Assigning SCSI tape read and write CLI commands
> - Configuring a data pattern for SCSI commands

> ## Detailed Steps

> To tune the required FCIP link using the SAN Extension Tuner Wizard in Cisco DCNM-SAN, follow these steps:

> 1. Right-click a valid FCIP link in the Fabric pane, and then select SAN Extension Tuner from the drop-down list. You can also highlight the link and choose Tools > Other > SAN Extension Tuner.

> You see the Select Ethernet Port Pair dialog box.

> 2. Select the Ethernet port pairs that correspond to the FCIP link you want to tune and click Next.

> Note The Ethernet ports you select should be listed as down.

> You see the Specify Parameters dialog box.

> 3. Create and activate a new zone to ensure that the virtual N ports are not visible to real initiators in the SAN by clicking Yes to the zone creation dialog box.

> 4. (Optional) Change the default settings for the transfer data size and the number of concurrent SCSI read and write commands as follows:
> 1. Set Transfer Size to the number of bytes that you expect your applications to use over the FCIP link.
> 2. Set Read I/0 to the number of concurrent SCSI read commands you expect your applications to generate over the FCIP link.
> 3. Set Write I/0 to the number of concurrent outstanding SCSI write commands you expect your applications to generate over the FCIP link.

> Note There is only one outstanding I/O at a time to the virtual N port that emulates the tape behavior.

> 1. Check the Use Pattern File check box and select a file that you want to use to set the data pattern that is generated by the SAN extension tuner. See the "Data Pattern" topic.
> 5. Click Next.

> You see the Results dialog box.

> 6. Click Start to start the tuner. The tuner sends a continuous stream of traffic until you click Stop.
> 7. Click Show to see the latest tuning statistics. You can select this while the tuner is running or after you stop it.
> 8. Click Stop to stop the SAN extension tuner.

> Copyright 2010-2015, Cisco Systems, Inc. All rights reserved.