The Cisco Nexus 1000V is a software implementation of a Nexus switch. It's comprised of 2 main components:
1. Virtual Supervisor Module (VSM) - In our environment, the VSM is made up of 2 VMs (Primary and Secondary)
2. Virtual Ethernet Module (VEM) - This component is installed onto each host. It's similar to a linecard.
I was attempting to install the VEM using VMware Update Manager (VUM). Unfortunately, I was unable to successfully complete the install, it kept on erroring out. I confirmed that VUM was configured successfully, restarted the VUM service etc..
It turns out, VMware High Availability (HA) must be disabled to complete the VEM install. After disabling HA at the cluster level, I was able to successfully install the VEM on all 4 ESX hosts in this particular cluster.
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