[opensuse-doc] Fwd: Re: More

I sent your concerns back to the requestor. He responds with the following. ---------- Forwarded Message ---------- Subject: Re: More Date: Monday 04 June 2007 11:58 From: Marcus Kraft To: Rebecca Walter , "Alexey Eremenko" Am Samstag 02 Juni 2007 21:10 schrieben Sie: Alexey , Rebecca, :) Thats why we try to get to a clear terminology. Alexey favors simple terminology like 'host', which I favour too in verbal communications. However, to provide written documentation and even tables where we display tested and verified combination (for eg. Novell YES certification), I feel the need for precise but still technology agnostic terms. Xen is a Hybrid Hypervisor/VMM, it needs both hypervisor layer and operating system to do its job (and IntelVT / AMD-V for fulvirtualization). Sometimes there is a need to distinguish all of these (hw/vmm/os), and yes, there is a need to be not bounded to the Xen terminology in hopefully all the documents we write for product doc, FAQs, product flyers, support bulletins, certification bulleting, presentations etc ... 'host' and 'virtualization host' will work for most people familiar with virtualization - however if one states 'virtualization host server' it takes the physical hardware into account IMHO - sometimes you what to express that you use a (phys) machine (server) to be the virtualization host. I admit that Linux term server usually refer to network services, but its also used for machine providing the server. Let me add some examples where we would use this terminology, too: virtualzation host server virtual machine x86 + Xen x86 machine + Xen + OS OS in VM IBM POWER PPC + DLPAR OS in VM IBM System z mainframe + LPAR + zVM OS in VM x86 + KVM x86 + Linux + KVM OS in VM x86 + openVZ x86 + Linux + openVZ OS in VM (container) x86 + VMware ESX x86 + ESX (incl. OS) OS in VM x86 + VMware WS x86 + Linux + WS OS in VM (I left out x86-64 and Itanium to reduced list) Hope that make things more clear. Regards Marcus

---------- Forwarded Message ----------

Subject: Re: [opensuse-doc] [STYLE] Virtualization Terminology Date: Saturday 02 June 2007 12:01 From: jdd To: Cc: opensuse-doc@opensuse.org

Alexey Eremenko wrote:

...

anything, let's as wild as Playstation, for emulation case - usually this would be x86 PC)

usually, not necessarily, gamebox emulators are prosent for age here :-)

good guess to don't forget them :-)

jdd

-- http://www.dodin.net http://gourmandises.orangeblog.fr/ --------------------------------------------------------------------- To unsubscribe, e-mail: opensuse-doc+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-doc+help@opensuse.org

-------------------------------------------------------

---------- Forwarded Message ----------

Subject: Re: [opensuse-doc] [STYLE] Virtualization Terminology Date: Saturday 02 June 2007 11:34 From: "Alexey Eremenko" To: opensuse-doc@opensuse.org

According to my basic terminology: *Host

Your real computer, on which the emulator/virtualizer software runs.

Host means both your real hardware and the operating system that controls that hardware. In some cases there can be only hardware without operating system, like VMware ESX.

The term "Host" describes both hardware and OS.

This can be devided to: *Host Hardware - your real hardware *Host Operating System - the operating system that controls that real hardware.

*Guest (also known as VM=Virtual Machine)

Your emulated computer, virtual machine, or VM for short, this is what you are trying to emulate. Your target. It can be the same, or very different from your real system.

For example, your host can be a Pentium III PC, while your guest can be a Sony Playstation. Of course, VirtualBox cannot emulate Playstations, so look at different software. It's just important that you understand those two basic concepts.

-This means both your virtual hardware _and_ an operating system that runs on your virtual hardware.

This can be devided to: Guest Hardware - your virtual hardware (can be anything, let's as wild as Playstation, for emulation case - usually this would be x86 PC) Guest Operating System - your OS, that runs on the virtual hardware. (can be anything, let's as wild as Playstation BIOS - but usually this would be Windows or Linux OS)

*Hyperviser/Virtualizer Software that does (Full/Para) virtualization.

*Hypercall Just like there are system calls, For para-virtual cases there are hyper calls. Actually a language between the para-virtualizer (hyperviser) and guest. Other types of virtualization doesn't use hypercalls.

Your term "virtual machine server" would be confusing. This is because the "server" term has usually something to do with networking, while virtualization can work nicely without networks, listening TCP ports, etc... Let's leave the term "server" to the programs that listen to TCP ports. Now if I understand you correctly, your term "virtual machine server" equals to my term "Host hardware" or "Host".

Additionally, those terms I just described are a LOT shorter than your terms, plus they are more accurate. It's a lot better to have accurate and short terms at once.

-- -Alexey Eremenko "Technologov" --------------------------------------------------------------------- To unsubscribe, e-mail: opensuse-doc+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-doc+help@opensuse.org

-------------------------------------------------------

---------- Forwarded Message ----------

Subject: Re: [opensuse-doc] [STYLE] Virtualization Terminology Date: Saturday 02 June 2007 08:42 From: jdd To: Cc: opensuse-doc@opensuse.org

Rebecca Walter wrote:

...

...

Virtual machine 1, virtual machine 2 two different (virtualized) computers guest: Linux, XP, W98, dos, freebsd...

there wouldn't be "guest" used here, if I have understood properly. It would be a virtual machine running whatever OS.

I think the "guest" concept is important, mostly if the host OS and the virtual machine OS are the same.

It's difficult to say anytime "openSUSE 10.3 on the host", "openSUSE 10.3 on the virtual machine"

in fact, I don't know what make difference between various guests fir the virtual machine, but as VMware as Virtual box asks for what guest you want at creation time (even is you can change mind afterward)

jdd

-- http://www.dodin.net http://gourmandises.orangeblog.fr/ --------------------------------------------------------------------- To unsubscribe, e-mail: opensuse-doc+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-doc+help@opensuse.org

-------------------------------------------------------

-- Mit freundlichen Gruessen / Best regards, Marcus Kraft (mkraft@novell.com) -- Marcus Kraft, Product Manager, SUSE Linux Enterprise, Virtualization fon: +49 911 74053-171 - fax: +49 911 74053-483 - email: mkraft@novell.com SUSE® Linux Enterprise 10 - Your Linux is ready - http://www.novell.com/linux/ SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg) ------------------------------------------------------- --------------------------------------------------------------------- To unsubscribe, e-mail: opensuse-doc+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-doc+help@opensuse.org