Hello,
This is an unusual setup, but I can provide some insights into your concerns.
1. If you leave the setup as is and reboot Fabric A, the ESX host should continue to function without disruption as long as it is properly configured for redundancy. Since the VLAN is defined in both "Dual Mode" and "Fabric A", the ESX host should be able to handle redundancy at the OS level with its teaming configuration.
2. If you delete the VLAN from "Fabric A" and leave the "Dual Mode", there could be a potential disruption depending on how the vNICs are configured and whether they can handle the redundancy properly. It is recommended to carefully evaluate the configuration before making any changes to ensure there is no disruption to the traffic flow.
As a best practice, it is advised to have a consistent VLAN configuration across both fabrics for proper redundancy and ease of management. If possible, consider reconfiguring the VLANs to avoid any confusion and potential issues in the future.
Please remember that making changes to the production environment should always be done with caution and during a maintenance window, if possible. Always ensure you have a valid backup of your configurations before making any changes.
Let me know if you have any other questions or concerns.
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