On Thu, Jun 13, 2013 at 10:47:32AM +0200, folkert wrote: > Hi, > > > > In virt-manager I saw that there's the option for cache writeback for > > > storage devices. > > > I'm wondering: does this also make kvm to ignore write barriers invoked > > > by the virtual machine? > > > > No, that would be unsafe. When the guest issues a flush then QEMU will > > ensure that data reaches the disk with -drive cache=writeback. > > Aha so the writeback behaves like the consume harddisks with write-cache > on them. > In that case maybe an extra note could be added to the virt-manager > (excellent software by the way!) that if the client vm supports > barriers, that write-back in that case then is safe. Agree? CCed virt-manager mailing list so they can see your request. Stefan -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
