Description of problem:
We should preallocate at least the metadata for new qcow2 disks (perhaps just system disks), to improve performance.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
Closing old bugs. If this issue is still relevant/important in current version, please re-open the bug.
I'd be happy to see this to somewhat reduce the performance gap with raw.
*** This bug has been marked as a duplicate of bug 672346 ***