Here's a weird problem that I discovered, which could be potentially really
serious. It involves the <MediaRegistry> section. I found the problem while
taking a look at my VirtualBox.xml. In there, I found the following, right
after the end of the MachineRegistry section. There were 3 HarDisk entries, but
I'll show only one for brevity. This is from a Win7 VM that I've had for ever
(since 4.x). It has one snapshot:
...
</MachineRegistry>
<MediaRegistry>
<HardDisks>
<HardDisk uuid="{3bee1763-6df5-44e3-9668-4d21aeb1d008}"
location="/Users/Shared/VirtualBox/Machines/Windows 7/Windows 7.vdi"
format="VDI" type="Normal">
<HardDisk uuid="{800cad41-7935-4840-83f4-b81d2f4af813}"
location="/Users/Shared/VirtualBox/Machines/Windows
7/Snapshots/{800cad41-7935-4840-83f4-b81d2f4af813}.vdi" format="VDI"/>
</HardDisk>
</HardDisks>
</MediaRegistry>
<NetserviceRegistry>
...
Now, that MediaRegistry section (perfectly fine looking) was *missing* from the
Windows7.vbox where it should be in the first place! Every time I would revert
the VM to the previous snapshot, the {snapshot}.vdi entry would change in the
VirtualBox.xml, because it was obviously missing from the corresponding
Windows7.vbox.
This weird Frankenstein-like combination of MediaRegistry entries was actually
working. When I say "combination" I mean that given the number of VMs that I
have, it seems that there's a sum of MediaRegistry entries from the
VirtualBox.xml and the all the *.vbox ones. That's why there wasn't actually an
operating problem.
The problem is that this VM was *NOT* portable/movable/backupable. I couldn't
simply take the VMfolder to another computer, because the .vbox was missing its
MediaRegistry section! Oops! And since that's the way that I backup my VMs to
an ext. HD, this could lead to serious trouble. That VM simply wouldn't work!
Anyone care to explain how this monstrosity may have come to life?
As always available on the #vbox channel for any questions...
Socratis
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