I used virtualbox on my workstation for several months before I actually
looked at the manual today.....so my compliments to whoever designed the
user interface. You definitely made it intuitive.
1) I found in the manual that a snapshot is storing the difference
between the contents of the guest's disk now and its contents at the
time of the snapshot. That being the case, does that mean that
snapshots gets updated every time the guest's disk changes? Doesn't
that mean every disk write on the VM = two writes on the host? Or if I
had 3 snapshots of the same VM, wouldn't that mean that each write on
the guest = 4 writes on the host....or does Virtual Box just store the
difference from one snapshot to another in order to avoid duplicating
the same data? In either case, it would seem wise to store snapshots on
different physical media than the VM disk images to avoid the
performance hit.
2) From the section in the manual regarding 3D acceleration: "When an
application in the guest then requests hardware acceleration through the
OpenGL or Direct3D programming interfaces, these are sent to the host
through a special communication tunnel implemented by VirtualBox, and
then the /host/ performs the requested 3D operation via the host's
programming interfaces." I think this implies that in the case of a
Windows guest on a Linux host Direct3D will never work since the Linux
host can't do that. Is that the case? If VirtualBox does take Direct3D
commands from the guest and convert them to OpenGL for the Linux host
then I will be suitably impressed.
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