[mythtv-users] ATSC Unwatchable
Joseph Fry
joe at thefrys.com
Wed Sep 12 02:28:29 UTC 2012
>
>
> Second... Xen works differently than VMware or Virtualbox... both of
> those operate ON TOP of an OS.... hypervisors like Xen and HyperV operate
> below the OS... the DOM0 OS is only there to manage the hypervisor, it's
> actually virtualized itself.
>
For clearification see:
http://en.wikipedia.org/wiki/Hypervisor
Robert P. Goldberg classifies two types of
hypervisor:[5]<http://en.wikipedia.org/wiki/Hypervisor#cite_note-4>
- *Type 1* (or *native*, bare
metal<http://en.wikipedia.org/wiki/Bare_metal>)
hypervisors run directly on the host's hardware to control the hardware and
to manage guest operating systems. A guest operating system thus runs on
another level above the hypervisor.
This model represents the classic implementation of virtual machine
architectures; the original hypervisors were the test tool,
SIMMON<http://en.wikipedia.org/wiki/SIMMON>,
and CP/CMS <http://en.wikipedia.org/wiki/CP/CMS>, both developed at
IBM<http://en.wikipedia.org/wiki/IBM> in
the 1960s. CP/CMS was the ancestor of IBM's
z/VM<http://en.wikipedia.org/wiki/Z/VM>.
Modern equivalents of this are Oracle VM Server for
SPARC<http://en.wikipedia.org/wiki/Logical_Domains>,
the Citrix XenServer <http://en.wikipedia.org/wiki/Xen>,
KVM<http://en.wikipedia.org/wiki/Kernel-based_Virtual_Machine>
, VMware ESX <http://en.wikipedia.org/wiki/VMware_ESX>/ESXi, and Microsoft
Hyper-V <http://en.wikipedia.org/wiki/Hyper-V> hypervisor.
- *Type 2* (or *hosted*) hypervisors run within a conventional operating
system <http://en.wikipedia.org/wiki/Operating_system> environment. With
the hypervisor layer as a distinct second software level, guest operating
systems run at the third level above the hardware.
BHyVe<http://en.wikipedia.org/w/index.php?title=BHyVe&action=edit&redlink=1>
, VMware Workstation <http://en.wikipedia.org/wiki/VMware_Workstation>
and VirtualBox <http://en.wikipedia.org/wiki/VirtualBox> are examples
of Type 2 hypervisors.
http://wiki.xen.org/wiki/Xen_Overview
Xen is an open-source type-1 or baremetal
hypervisor<http://en.wikipedia.org/wiki/Hypervisor>
...
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