Benefits to Solving

By upgrading from an old virtual network device, such as a Vlance adapter, to the latest VMXNET3 paravirtualized drivers, VMware performance for the virtual machine can be dramatically improved.
This is because a Vlance adapter creates many more unnecessary IRQ requests compared to a VMXNET3 and a Vlance is not able to use any of the physical NIC features to offload and optimize network packets.
Therefore older network virtual network devices can cause slow VMware performance for the VM they are attached to as well as negatively affect all other VMs due to the noisy neighbor syndrome.

Ease of Solving

The easiest way to solve this issue is to use the following four-step process. (Note that the virtual machine must be rebooted to update the virtual network adapter type.)

  1. Upgrade the virtual machine hardware by:

  2. Shutting down the virtual machine
  3. Right-clicking on the virtual machine
  4. Going to "All vCenter Actions", to "Compatibility", and then clicking on "Upgrade VM Compatibility"
  5. Select the new VM compatibility mode to the latest compatibility mode which, as of today, is ESXi 5.5 and later, then click OK

  6. Add a new virtual network adapter by:

  7. Clicking "edit settings" for the virtual machine
  8. Clicking on "Select" next to New Device
  9. Clicking on "Network"
  10. Clicking "Add" then setting the new virtual network device’s network to match the current network of the out of date virtual network adapter
  11. Expanding the virtual network device
  12. Setting the adapter type to the latest version (which at this time is VMXNET 3)

  13. Remove the old virtual network adapter (which is still in settings) by clicking on the X next to the old adapter, then clicking OK
  14. Power On the virtual machine and, once booted, reconfigure the new virtual network adapter with the IP configuration of the old virtual network adapter.

How opvizor helps

In order to prevent poor VMware performance slowing down the application as a result of outdated network adapters, opvizor is able to quickly identify the virtual machines that run such virtual network adapters (Figure 1). With this information, you’ll be able to update the virtual machines that are out of date and prevent application performance issues before they impact users. old VMware NIC causing bad VMware performance - opvizor
Additionally, you’ll be able to eliminate the finger pointing that all too commonly occurs when there is poor network performance in the virtual infrastructure.
Thanks David Davis

CHECK Part 1

Metrics and Logs

(formerly, Opvizor Performance Analyzer)

VMware vSphere & Cloud

Monitor and Analyze Performance and Log files:
Performance monitoring for your systems and applications with log analysis (tamperproof using immudb) and license compliance (RedHat, Oracle, SAP and more) in one virtual appliance!

Subscribe to Our Newsletter

Get the latest product updates, company news, and special offers delivered right to your inbox.
Share on twitter
Share on linkedin
Share on facebook
Share on email

Subscribe to our newsletter

White Paper — Registration

We will send you the research paper via email.

CodeNotary — Webinar

White Paper — Registration

Please let us know who you are, so we can send you the CodeNotary Trusted Software Supply Chain white paper.

Become a partner

Start Your Trial

Please enter contact information to receive an email with the virtual appliance download instructions.

Start Free Trial

Please enter contact information to receive an email with the free trial details.