> > +) Each VM slice get's a specific amount of RAM dedicated to it (no 
> > +other VM or the host OS can use it).  Make sure that this is enough.
>
> I'm not sure if this is true.  I don't have a lot of 
> experience with VMWare ESX, but running VMWare server on top 
> of Windows, if I allocate 2GB to a VM, but the VM only uses 
> 256mb, that's all that it will use, the host or other VMs can 
> use the free RAM.

This is the default behavior for ESX 3 as well, I think. However, you can't
dynamically increase the amount of memory that a guest OS will use; you must
set a maximum, which is what the guest will think is the actual physical
memory. To change the maximum, you must stop the VM, edit its settings, then
restart it.

Within ESX, memory management can get pretty complicated. While this was
written for a previous version of ESX, it's a good explanation for how
memory management works within ESX:

http://www.waldspurger.org/carl/papers/esx-mem-osdi02.pdf (PDF version)

http://72.14.209.104/search?q=cache:xvUNqOqWAdQJ:www.waldspurger.org/carl/pa
pers/esx-mem-osdi02.pdf+vmware+esx+guest+memory+allocation&hl=en&ct=clnk&cd=
3&gl=us&client=firefox-a (HTML from Google cache)

Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/

Fig Leaf Software provides the highest caliber vendor-authorized
instruction at our training centers in Washington DC, Atlanta,
Chicago, Baltimore, Northern Virginia, or on-site at your location.
Visit http://training.figleaf.com/ for more information!

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