[Qemu-discuss] qemu - cache=none / yet cache used?

For now, at least, I'm stuck with an old version of qemu-kvm qemu-kvm-0.12.1.2 qemu is set as cache=none I see that in libvirt and I see that doing a ps on qemu-kvm. Yet, using "vmtouch" I see that (where ID is the real instance ID), to the matching disk: /var/lib/nova/instances/'id'/disk it's us

[Qemu-discuss] qemu - cache=none / yet cache used?

Even if cache=none, could the -OS- decide to put the disk file in the page cache? Restarting the VM, the disk file did not go into cache. Time will tell, if it eventually goes there. Thanks