Disk-Image Format raw vs qcow2 Raw file format provides slightly better performance while qcow2 offers advanced features such as copy on write and LiveSnapshots. vzoltan 10 mo. . Both have there pros and cons, with speed and less overhead going to LVM. <id><filename>. Sep 14, 2011 Raw is much like a dd copy of a hard drive. raw, it would look like so unused0 local102virtual-machine. Version 7. Mar 23, 2015 On the other hand, Qcow2 has two layer of indirection that must be crossed before to hit the actual data As the overlay layer must be a Qcow2 file, you don&39;t lose the ever-useful snapshot capability (RAW images don&39;t support snapshots by themselves) The choice between base image qcow2 overlay vs multiple full copies depends on your priority. . Aug 28, 2011 Within my Proxmox VE lab infrastructure, I have some virtual machines using the qcow2 format (the VM 101) and others are using raw format (Vm 107) Click to enlarge The screenshot above shows you that the VM101 has a disk of 20 GB and that the VM107 is using a disk that can have a maximum size of 25 GB. RAW This is a raw file format. On the other hand, QCOW2 allows you to create a "thin provisioning" disc;. From here we have to convert it to a VM, but first make sure the VM is created and find the unique ID.