is xen and xen server type 2 hypervisiors
Guys I'm wanting to play around with XCP 1.1 I'm getting ready to virtualize my home lan and lab and I'm not liking the limitations on Vmware's new ESXI version 5 which is why I'm looking at other options. First off, I would like to ask about Xen and Xenserver I always hear about datacenters like Rackspace using open source virtualization so are they using XCP, Xen, or Xen Server? Because from what I'm seeing Xen and Xen Server are type 2 hypervisiors basically the same as Hyper V I'm a big fan of type 1 hypervisiors. I assume if these datacenters are running Xen or Xen Server they must really go out of there way to lean up the host os basically only running needed services on the box.
DeHackEdBill Ate Tux's Rocket
Xen is a type 1 hypervisor.
Xen itself has almost no hardware drivers. It's barely able to control the PCI bus and really only does CPU and memory management. It boots up your "host" OS (I'll assume it's Linux, but it must be a dom0 capable OS) as a fully fledged virtual guest but with default full access to the PCI bus and permission to give commands to Xen.
Thus your Host OS is really Xen and your first guest is what you're accustomed to thinking of as the host. It also means the host is subject to its own policy decisions, such as number of allowed CPUs, memory limitations and scheduling priorities. How's that for isolation?