qed format what?

Question

KVM

Hi all! There is very little information on the Internet about the qed image format for qemu/kvm. Does it make sense to use it compared to raw and qcow2? Well, along the way, another question - when specifying a location for the LVM image of the volume, Win2008Srv hangs at the formatting stage and gives an error. After that, the virtual machine does not start. Writes an error about the wrong image header. Those. the repository gets corrupted somehow. The cache is disabled. centos 6.4