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24/02/2008, 21h19

On Sun, 24 Feb 2008 19:11:47 GMT, newscorrespondent@charter.net wrote:

>I am trying to configure a computer (yet to be purchased) to use virtual (pc
>or server) and can't figure out how to plan for memory. If Vista is used as
>the host and it can only use a little more than 3gb of memory and if I
>understand my reading the sum of all memory for virtual machines could not
>exceed the physical memory available or is that the memory available to the
>host OS?

Go with an x64 host os, and you lose this restriction.

>
>If I have a 4gb machine can a VM use the part of that 4gb that my host Vista
>cannot use? What about on a 6gb machine?

No, if the host OS can't access, no app can, and VPC and Virtual
Server are just apps runningon the host OS.

>
>I need to support Vista, XP, Server2003 and Server2008 when available. The
>servers will have SQL2000, SQL2005 and SQL2008 (when available) and at times
>Oracle and PostgreSQL. The machine is for application development and will
>not be used in a "production" mode. It is not clear to me what is the best
>choice for my host OS. It seems that if I host with Server2003 I might be
>able to better utilize more memory, is that true?

Yes, 32bit server OSes have less restrictions on memory, depending on
the version. Vista x64, XPx64 don't have the 4GB limit either.

>
>I am inclined to use Virtual Server, but don't really know if that provides
>any advantage over Virtual PC, any suggestions?

It really depends on what you want to do. Virtual PC is designed for
working with VMs a lot and directly. Virtual Server is designed for
running servers in the background. MS has docs on the differences and
the diffrences between the two have been covered in the newsgroups
extensively many times before.

--
Cheers,
Steve Jain, Virtual Machine MVP
http://vpc.essjae.com/
I do not work for Microsoft.

24/02/2008, 21h19	#3
Steve Jain Messages: n/a Hébergeur:	Re: Memory On Sun, 24 Feb 2008 19:11:47 GMT, newscorrespondent@charter.net wrote: >I am trying to configure a computer (yet to be purchased) to use virtual (pc >or server) and can't figure out how to plan for memory. If Vista is used as >the host and it can only use a little more than 3gb of memory and if I >understand my reading the sum of all memory for virtual machines could not >exceed the physical memory available or is that the memory available to the >host OS? Go with an x64 host os, and you lose this restriction. > >If I have a 4gb machine can a VM use the part of that 4gb that my host Vista >cannot use? What about on a 6gb machine? No, if the host OS can't access, no app can, and VPC and Virtual Server are just apps runningon the host OS. > >I need to support Vista, XP, Server2003 and Server2008 when available. The >servers will have SQL2000, SQL2005 and SQL2008 (when available) and at times >Oracle and PostgreSQL. The machine is for application development and will >not be used in a "production" mode. It is not clear to me what is the best >choice for my host OS. It seems that if I host with Server2003 I might be >able to better utilize more memory, is that true? Yes, 32bit server OSes have less restrictions on memory, depending on the version. Vista x64, XPx64 don't have the 4GB limit either. > >I am inclined to use Virtual Server, but don't really know if that provides >any advantage over Virtual PC, any suggestions? It really depends on what you want to do. Virtual PC is designed for working with VMs a lot and directly. Virtual Server is designed for running servers in the background. MS has docs on the differences and the diffrences between the two have been covered in the newsgroups extensively many times before. -- Cheers, Steve Jain, Virtual Machine MVP http://vpc.essjae.com/ I do not work for Microsoft.