Comment 7 for bug 1330873

I'm concerned about this behavior. If the instance name must be unique, and it's truncated at any level, then if we specify the display_name as long enough, we can cause a name clash in vmware. I understand that conventional vmware ops are used to seeing human-readable names in vcenter, but this is cloud. It's one thing if we set the display_name in metadata somewhere for tracking, but the unique bits should be generated, and are for the other drivers AFAIK. IMHO, we should use nothing other than the uuid for the instance name.