A useful feature with virtual hosts is the ability to migrate a virtual server from one physical platform to another without shutting it down.  VMware vMotion is an example of this technology.  With Avanti, the USB key must follow the virtual host so that Avanti continues to run.  A network USB device is required to allow the USB key to follow the Avanti instance.  The following solutions are known to accomplish this and are in use at Avanti customer sites.

•Digi AnywhereUSB: http://www.digi.com/products/usb/anywhereusb

•SEH myUTN Deviceserver: http://www.seh-technology.com/products/usb-device-servers.html