HP Cisco MDS 9216i Cisco MDS 9000 Family Fabric Manager Configuration Guide - - Page 601

Chapter 27 SAN Device Virtualization Configuring SDV Send documentation comments to [email protected] Figure 27-8 Virtual Devices tab Step 10 Click Create to create the virtual target. Step 11 Click the CFS icon to commit and distribute the configuration changes. The pWWN of the virtual target does not appear in the zoning end devices database in Fabric Manager. If you want to zone the virtual device with a pWWN, you must enter it in the Add Member to Zone dialog box when creating a zone. However, if the device alias is in enhanced mode, the virtual device names appear in the device alias database in the Fabric Manager zoning window. In this case, users can choose to select either the device alias name or enter the pWWN in the Add Member to Zone dialog box. For more information, see the "Adding Zone Members" section on page 30-14. Set the device alias mode to enhanced when using SDV (because the pWWN of a virtual device could change). For example, SDV is enabled on a switch and a virtual device is defined. SDV assigns a pWWN for the virtual device, and it is zoned based on the pWWN in a zone. If you later disable SDV, this configuration is lost. If you reenable SDV and create the virtual device using the same name, there is no guarantee that it will get the same pWWN again. You would have to rezone the pWWN-based zone. However, if you perform zoning based on the device-alias name, there are no configuration changes required if or when the pWWN changes. Be sure you understand how device alias modes work before enabling them. Refer to Chapter 31, "Distributing Device Alias Services" for details and requirements about device alias modes. Linking a Virtual Device with a Physical Device After creating a virtual device and configuring it as part of a zone, you can define the primary device for it using the link command, which is also used to fail over to the secondary device. Note When a link operation fails over to the secondary device, the virtual device is taken offline, and then brought online. As of MDS NX-OS Release 4.1(1a), the following conditions must be considered before linking a device: • If you link to the secondary device which is currently active because of failover, the primary tag is moved to the secondary device and the secondary device becomes the primary device. • When the secondary device is active, if you link to a third device, and if the fallback attribute was not configured, the third device becomes the primary device but the secondary device continues to be the active device. OL-17256-03, Cisco MDS NX-OS Release 4.x Cisco MDS 9000 Family Fabric Manager Configuration Guide 27-7