Greg,

On Wednesday 24 December 2008, Gregory Nowak wrote:
> The subject pretty much asks my question. Is it possible for me to run
> a guest os in vbox, with more ram assigned to it than is on the
> physical host, (I.E,.. run a guest with 800Mb of ram on a host that
> has 512Mb of ram)? In theory, this should be possible on a gnu/linux
> host, provided I have enough swap. How about on a windows host?

I would suggest you not to try that. The guest will run fine as long
as it does not touch all physical memory it needs. For instance, Windows
will touch all memory during boot. As a result your VM will be paused
and you will get a message box explaining that the guest is currently
stopped and you have to free more memory. Linux guests are a bit nicer,
they will usually not touch all the memory you assigned to the VM.
VirtualBox assigns memory to the guest in 1MB blocks.

Note: As soon as a block of physical memory of the host is assigned to
the guest, it is marked as non-swappable and it will not be freed before
that VM finished. This will be changed in future versions of Virtualbox
(e.g. ballooning).

Kind regards,

Frank
-- 
Dr.-Ing. Frank Mehnert    Sun Microsystems    http://www.sun.com/

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