I ran into a situation recently where a client needed a USB drive connected directly to a VMware ESXi 4.1 host. As many of you know, getting USB pass-through working is a challenge in itself. There are lots of requirements to be met at both the host level and the guest VM level. The strange part was that I seemingly met all those requirements.
I had already added my USB bus controllers through Configuration –> Advanced Settings on the ESXi host. I had rebooted. Seemingly everything looked great and appeared as if it were passing through. I confirmed my VM was running Hardware Version 7 and I added the USB Controller without incident. However, the USB devices were greyed out and when I selected it I received the following message.
There are no USB devices connected to the host.
Initially, I had enabled all USB buses for pass-through. What I ultimately found was that by disabling the EHCI USB bus back in Configuration –> Advanced Settings, along with another reboot, did the trick. The above message went away and USB devices were no longer greyed out. I was then able to add my USB drive to my VM without incident.[Read more…] about USB pass-through on ESX 4.1 – have you considered this?