xVM Server and xVM Virtualbox
I´ve got the question several times in customer meetings, mails and even in comments in my blog: “Why has Sun two hypervisors? When should we use xVM server? When should we use xVM Virtualbox?” I find this question a little bit strange. No one asks: When should we use VMware Workstation, when should we use VMware ESX, and what´s with VMware GSX … sorry … VMware Server. So … the difference is simple: Use xVM Virtualbox for your virtualisation needs on your desktop and use xVM Server for the virtualisation in the datacenter. It´s as simple as that. Future developments in both classes of virtualisation may give us a area where both systems are viable ways to do the job (e.g. there are plans to integrate live migration to VirtualBox), but at the moment this should give you a guideline. Of course you could use xVM Server on your desktop system and VirtualBox on your server, but that aren´t their primary use cases.