On Mon, Apr 16, 2012 at 09:34:41AM +0100, Stefan Hajnoczi wrote: > On Sun, Apr 15, 2012 at 5:16 AM, Ron Edison <ron@xxxxxxxxx> wrote: > > The server is a Dell R710 with an H700 controller with 1gb of nvcache. Writeback cache is enabled on the controller. There is a mix of linux and windows guests, some with qcow2 format vdisks and others with raw format vdisks. Some of these guests have wb cache enabled on the vdisks and some do not. > > -drive cache=writeback is safe when the guest flushes appropriately. > If the guest is not sending flushes (e.g. ext3/4 barrier=0) then there > are no guarantees. Which is the default for ext3 on RHEL/CentOS < 6, btw. -- 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
