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## Modifying Fibre Channel Port Mask 

When the host is configured, by default it has access to all fibre channel ports on the DS8900F system. To view this, select a host from the Hosts window, then select Properties from the right-click menu displayed to view the window shown in Figure 11-74. 

<img src='content_image/991926.jpg'>

If the system administrator wants to restrict the fibre channel ports that can communicate with the host, fibre channel port masking  needs to be defined. Modify the fibre channel port mask to allow or disallow host communication to and from one or more ports on the system. 

To do so, complete the following steps: 

1. From the Hosts window, select the host to modify the fibre channel port mask. Right-click, or from the Actions tab, select Modify Fibre Channel Port Mask . 

2. A list of the DS8900F fibre channel ports is displayed. Select one or more ports to disallow. You can use the Ctrl or Shift key for multiple selections. Click Save . See Figure 11-75. 

