22 Feb
2016
22 Feb
'16
12:31 p.m.
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