[PVE-User] Strange Data Loss in Virtual Machines

Theron T. Trout theron.trout at mellonway.com
Tue Jan 6 20:48:46 CET 2009

Thank you, István.

Your observations are exactly in line with what I've been thinking about
this, and what I've been saying to my client.  I feel a bit reassured. 

Your idea of his method of stopping the virtual machines is a good one.
I'll check with him to make sure he isn't "yanking the plug" as you
aptly put it.

Thanks again,

On Tue, 2009-01-06 at 20:36 +0100, Pongracz Istvan wrote:
> 2009. 01. 6, kedd keltezéssel 12.11-kor Theron T. Trout ezt írta:
> > The problem is that various settings configured within Windows are being
> > lost whenever the virtual machines are rebooted.  These settings include
> > system process passwords, IIS configuration passwords, and other
> > security related settings.  He has not seen this problem on any of his
> > physical servers.
> > 
> > I can't think of any reason why Proxmox/KVM could be responsible for
> > this problem, but out of his frustration with the problem he needs a
> > more a definitive answer.  He is concerned that Proxmox/KVM is writing
> > these changes to some temporary page that isn't synced to the virtual
> > hard drives when the machines are rebooted/stopped.  I suggested that
> > this seems pretty unlikely and made no sense to my why the two issues
> > would be related.
> Hi,
> First, I am not a windows guru, but I am afraid, theres is nothing
> proxmox related problems but windows.
> Please correct me, if I am wrong.
> Your client described his problem: lost particular system settings,
> especially security ones. If kvm does not write pages to the virtual
> hard drive, lot of random data losts must happen.
> He told you, this happens (every) reboots and with more windows servers.
> Did they run antivirus softwares? 
> Are they really sure, they did nothing "special" with those servers?
> Anyway, how they reboot their virtual machines? Are they reboot the
> windows from the VE (remote desktop - Start menu -> Reboot) or they just
> "stop" the windows using proxmox GUI?
> I think, they should do the first one, as they do with physical
> machines. I can imagine similar problem as they described if they simply
> pull off the "power cord" (I mean, simply stop the virtual machine).
> Good luck,
> István

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