Staff would like to know if anyone here in the group has done a comparison between RAW and qcow2 discs to see if the performance loss is even as large as speak. I ask this because I saw on the KVM project site a comparative table, however is based on a version of qemu 2009 apparently, so I wonder if it is still valid or hear improvements in qcow2. http://www.linux-kvm.org/page/Qcow2 <https://mailtrack.io/trace/link/2cd1d17a672a9ef035e4ccde270c972ff570e5bd?url=http%3A%2F%2Fwww.linux-kvm.org%2Fpage%2FQcow2&signature=6e9e7cecfbc07652> Another doubt that I have with respect to this article, which he said is the IDE driver has outperformed virtio, the new version is so? I question this because I always read the virtio driver is the most suitable for an installation using KVM. Thank you in advance for help. Att. Tácio Andrade, Undergraduate in Computer Science, Network Analyst at the Universidade Estadual do Sudoeste da Bahia - Campus of Vitoria da Conquista, Ba and IT Consultant.