We often come across Virtual Machines facing performance issues. There are multiple causes for this sort of issues like high CPU or Memory usage. There could be issues due to the network switches connected to the Host machines as well. However there is one more thing that a VMware admin can check on the Virtual Machine.
Below I have mentioned the steps to find out if there are any Ghost Network Adapters present on the Virtual Machine. Basically if there is a Ghost [or Phantom] NIC card present on the machine, this could also lead to connectivity issues or performance issues. Sometimes presence of Ghost NIC Cards does not allow us to configure the newly added NIC adapters. The Ghost NIC cards are registry entries created on the machine when a Virtual NIC card is added\removed from the VM settings. We need to make sure these Ghost NICs are checked if you encounter performance related or Networ related issues on the server.
Please find the steps below
1. Login to the Windows Server2. Open Command Prompt and Run "set devmgr_show_nonpresent_devices=1"
3. The control will move to the next line without any output
4. Type "Devmgmt.msc". This will open Device manager
5. Click on "View" Menu and Select "Show Hidden Devices"
6. Uninstall all greyed NIC cards except for RSA Async Card
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