CentOS 6.2, using latest KVM drivers for Windows guests. Using LVM for storage, software raid 10, RAW with write cache disabled in the virt manager. When using virtio drivers for disk drives Windows Server complains about write caching being enabled. I can't disable it either. Using IDE prevents this from being happening, however the performance sucks. All searches related to fixing the write cache issue results in it being a controller setting, bios setting or manufacturer flaw. Since this is all software raid, LVM and Red Hat's virtio drivers it doesn't apply (or at least is fixable by others methods). My concern is data integrity over performance, but I'd like to know what others are doing. My fallback plan is to use IDE for the OS and virtio for the Data drive, moving Exchange and the folder redirects to the data drive (or even a different server install attached to the domain), but I'd appreciate others experiences before I resign to dealing with this limitation. Thanks, Jacob