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Appendix C

Glossary of Terms

Atropos One of the CPU schedulers provided by Xen. Atropos provides domains

with absolute shares of the CPU, with timeliness guarantees and a mechanism

for sharing out ‘slack time’.

BVT The BVT scheduler is used to give proportional fair shares of the CPU to do-

mains.

Exokernel A minimal piece of privileged code, similar to a microkernel but provid-

ing a more ‘hardware-like’ interface to the tasks it manages. This is similar to

a paravirtualising VMM like Xen but was designed as a new operating system

structure, rather than speciﬁcally to run multiple conventional OSs.

Domain A domain is the execution context that contains a running virtual machine.

The relationship between virtual machines and domains on Xen is similar to

that between programs and processes in an operating system: a virtual machine

is a persistent entity that resides on disk (somewhat like a program). When it is

loaded for execution, it runs in a domain. Each domain has a domain ID.

Domain 0 The ﬁrst domain to be started on a Xen machine. Domain 0 is responsible

for managing the system.

Domain ID A unique identiﬁer for a domain, analogous to a process ID in an operat-

ing system.

Full virtualisation An approach to virtualisation which requires no modiﬁcations to

the hosted operating system, providing the illusion of a complete system of real

hardware devices.

Hypervisor An alternative term for VMM, used because it means ‘beyond supervi-

sor’, since it is responsible for managing multiple ‘supervisor’ kernels.

Live migration A technique for moving a running virtual machine to another physical

host, without stopping it or the services running on it.

Microkernel A small base of code running at the highest hardware privilege level. A

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Belkin XM Commander Bedienungsanleitung Seite 55