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Recommended Microsoft NLB Mode for VMotion

Details

I want to use VMotion to migrate my virtual machine. The guest operating system is running Microsoft NLB (Network Load Balancing) service. Which NLB mode should I choose?

Solution

VMware recommends using multicast mode with Microsoft Network Load Balancing service.

Unicast NLB does not work properly when NotifySwitch is set to 1. This is a design limitation in unicast mode. See www.vmware.com/support/kb/enduser/std_adp.php?p_faqid=1556 for more information.

You should not change the VMkernel advanced setting Net.NotifySwitch from the default value of 1 for ESX Server systems involved in VMotion. This value ensures that the virtual machines' network connectivity is maintained after migration.

Keywords

1573; MS; network; load; balancing

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  • KB Article: 1573
  • Updated: Aug 14, 2009
  • Products:
    VMware ESX
    VMware VirtualCenter
  • Product Versions:
    VMware ESX 2.0.x
    VMware ESX 2.1.x
    VMware ESX 2.5.x
    VMware ESX 3.0.x
    VMware VirtualCenter 1.0.x
    VMware VirtualCenter 1.1.x
    VMware VirtualCenter 1.2.x