Use the Select LUN Mapping screen to configure logical unit number (LUN) mapping for the selected Fibre Channel (FC) host.

During device discovery, a particular partition or tape drive could map to a higher LUN space than is optimal for a particular application. Host mapping enables you to create a virtual private remapping of available LUNs for specific host application. When compared to channel zoning, host mapping is a more precise way to give hosts access to partitions and tape drives.

Note: If both channel zoning and host mapping are enabled, the channel zoning settings supersede any host LUN mapping on the I/O blade. If a device is zoned out, it cannot be mapped.

Note: LUN 0 (zero) is typically assigned to the command and control LUN (CCL), unless it has been manually mapped to another LUN. Make sure at least one device is mapped to LUN 0 (zero).

Note: You cannot map a tape drive to a host if that drive is currently configured as a control path.

Note: Depending on host operating system constraints, it might be necessary to reboot or reconfigure the host because of device map change that result from configuring host mapping.

Do the following:

    1. Select the check box next to the partition or tape drive you want to map. This activates the LUN text box for the tape drive or partition. If more than four partitions or tape drives are configured, select the Page 1 of x arrow to view the additional devices.
    2. Tap the LUN text box and use the keypad to enter a LUN number.
    3. Repeat steps 1 and 2 for each additional partition or tape drive.
    4. Select Apply.

Note: At any time, select Back to return to the previous screen. Select Cancel to return to the Setup menu.