Issues with Server 2012 using DFSR running on Hyper-V 2012

Solution 1:

Ok I am not sure if this will be of any help but the factor I have in common with you is that i had my drives connected to a PERC H310 controller and I was running a file server in a Virtual environment mapping its data drive to a Raw disk connected to the same H310. At random times usually during periods of High I/O The virtual machine would complain that it could not access the drive and would crash. I ended up connecting the drives to the onboard Intel controller and had no problems since. I personally think the low end Perc cards have quirks that can cause issues with I/O sensitive operations.