On Fri, Feb 19, 2016 at 08:50:12AM +0100, Martin Kletzander wrote: > On Fri, Feb 19, 2016 at 07:16:12AM +0100, John Obaterspok wrote: > >I changed from vmdk to raw and the Write performance went from 1.6 MB/s to > >~100 MB/s > > Now that's interesting! Of course raw will be faster but by 2 orders of > magnitude? That seems unreasonably much more than it should be. > > >Is vmdk write performance so bad? > > > > I can't say, I wouldn't even expect that -- that's why I didn't even > suggest it. The only native formats in QEMU are raw, qcow2, and qed. They support parallel I/O. All other formats are only suitable for qemu-img convert so you can import/export images. Depending on the workload there can be a large performance difference. Stefan
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