[Xen-users] Major corruption of Windows HVM disks - Xen 3.4

[Adam Wilbraham <adam.wilbraham@xxxxxxxxxxxxxxxx>]

I've come back into work after the weekend and noticed that all (3) of 
our Windows HVMs have had massive issues with corruption of the hard 
disks. These have all been running rock solid on Xen 3.2.1 for the past 
9 months or so but I upgraded their host to Xen 3.4 last week.
 I noticed on Friday morning that all 3 had randomly rebooted on 
Thursday evening but tried not to think too much of it.  Unfortunately 
as I say I have come in this morning and they are all in various states 
of disrepair.
One VM is claiming ntloader.exe is not on the disk (presumably with a 
number of other files), the other had crashed so I started it back up, 
it ran checkdsk before running through lots of corrupt and missing 
files, rebooting and is now BSODing on boot and the third boots but  has 
an event log full of SQL Server errors talking about file corruption. As 
such I'm having to restore all three from backups which is not ideal.
Has anyone experienced anything similar to this? Is it likely to be a 
problem with qemu rather than Xen? Either way, I am left with no choice 
than to roll back to a previous version of Xen as I cannot risk this 
happening again.
Thanks,

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