The changelog says 64-bit guest on 32-bit host support was added in 2.1:

http://www.virtualbox.org/wiki/Changelog

On Thu, Feb 26, 2009 at 10:48 AM, Brian Hechinger <wo...@4amlunch.net> wrote:
> On Wed, Feb 25, 2009 at 07:14:14PM -0600, Harry Putnam wrote:
>>
>> My whole purpose is to experiment with zfs... would I see much
>> difference if opensol was installed 64 bit as compared to 32 bit?
>>
>> I noticed the Simon blogs that describe how to setup a home zfs server
>> ( http://breden.org.uk/2008/03/02/a-home-fileserver-using-zfs/ )
>> mention it is best setup 64 bit, but no real reason is given.
>
> I think it would be better to answer this question that it would to attempt
> to answer the VirtualBox question (I run it on a 64-bit OS, so I can't really
> answer that anyway).
>
> The benefit to running ZFS on a 64-bit OS is if you have a large amount of 
> RAM.
> I don't know what the breaking point is, but I can definitely tell you that a
> 32-bit kernel and 4GB ram doesn't mix well.  If all you are doing is testing 
> ZFS
> on VMs you probably aren't all that worried about performance so it really 
> shouldn't
> be an issue for you to run 32-bit.  I'd say keep your RAM allocations down, 
> and I
> wish I knew what to tell you to keep it under.  Hopefully someone who has a 
> better
> grasp of all that can chime in.
>
> Once you put it on real hardware, however, you really want a 64-bit CPU and 
> as much
> RAM as you can toss at the machine.
>
> -brian
> --
> "Coding in C is like sending a 3 year old to do groceries. You gotta
> tell them exactly what you want or you'll end up with a cupboard full of
> pop tarts and pancake mix." -- IRC User (http://www.bash.org/?841435)
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