Using VMware's ESXi, can I plug in 30 USB Wireless adapters and allow each of 30 VMs one?

Question

I'm assuming ESXi will act very similarly to VMware Workstation or other products, so answers based on knowledge of those programs might also help.

I want to plug in 30 USB Wireless or Ethernet adapters into my server, and let each VM access one and only one of these devices.

Unfortunately, I don't have the hardware to just try it out as the purchase of hubs and adapters hinges on the result of this question.

The answer could be a resounding "yes, easy!" and that would be great. I couldn't find any answers to this question with google, and it's possible that this is because it's so easy to do.

Solution

I have strong doubts about whether this would work. ESXi does support USB hardware passthrough, but not for every type of USB device.

Our system coped fine with USB memory sticks and a USB lead to a UPS for monitoring it, but ESXi would not 'see' the card/fob reader for our building security system so we could not pass it to a VM.

Probably best to contact VMWare themselves.

Edit: Read these knowledge base articles:

• USB support for ESX/ESXi 4.1

• Supported USB device models for passthrough from an ESX or ESXi host to a virtual machine

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1022290

http://kb.vmware.com/selfservice/microsites/search.do?cmd=displayKC&externalId=1021345

Comments

[31eee384]

Hmm, thanks for the info, I'll look into that tomorrow.

[31eee384]

According to your first link, "The USB arbitrator can monitor a maximum of 15 USB controllers. [Additional controllers] are not available to the virtual machine." If I understand what a USB arbitrator is, that completely obliterates the possibility of having 30+ USB network adapters used directly by the virtual machines. Hmm. Now I'm thinking that if each network adapter was recognized by the host, VMware could potentially give each connection to a VM. From this document: vmware.com/pdf/vsphere4/r40/vsp_40_config_max.pdf it seems that maybe it would work, depending on adapters.

[31eee384]

(I was going to add that I'm currently looking into this, and will post another question if I can't find the information I'm looking for--but I ran out of characters. Thanks for the help, Linker3000!)

[Linker3000]

Hope you get a definitive answer - I think it's still likely that this can only come from VMWare themselves. I still worry that you won't find a supported adapter.

[31eee384]

True, I should look into contacting them before making a decision about this. It may all be unnecessary, though--there are options besides many usb network adapters. I'm just exploring all options and this happened to be particularly difficult to investigate. I did manage to find a Russian article with a table of supported usb devices, though; a USB wireless adapter and USB ethernet adapter are included. (esx.cx/p/unsupported-usb-device-models-for.html) I don't trust this source too well, but if I need to test this idea I can at least select an adapter that someone else has working.