On Mon, Apr 16, 2012 at 09:34:41AM +0100, Stefan Hajnoczi wrote: > On Sun, Apr 15, 2012 at 5:16 AM, Ron Edison <[email protected]> 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 [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
