Re: [Qemu-devel] [Bug 1399191] [NEW] Large VHDX image size

[Jeff Cody]

On Wed, Jan 07, 2015 at 03:30:28PM +0000, Stefan Hajnoczi wrote:
> On Thu, Dec 04, 2014 at 01:31:38PM -0000, AMULYA L wrote:
> > Public bug reported:
> > 
> > We are trying to convert a VMDK image to VHDX image for deploy to HyperV 
> > Server ( SCVMM 2012 SP1) using qemu-img.
> > We tried converting the image using both 'fixed' as well as 'dynamic' 
> > format. We found that both the disks occupy the same size of 50GB. When the 
> > same is done with VHD image, we found that the dynamic disks are much 
> > lesser in size (5 GB) than the fixed disk (50GB). 
> > 
> > Why is that the VHDX generates large sized images for both the formats?
> > 
> > The following commands were used to convert the vmdk image to VHDX
> > format
> 
> Jeff, did you fix this recently in commit
> 85b712c9d5b873562c864e72f69cbf0d87d2fe40 ("block: vhdx - set
> .bdrv_has_zero_init to bdrv_has_zero_init_1")?
> 
> Stefan



Yes, although there has been a report that there are issues in the
resulting vhdx image in a MS server, after this patch.  I am going to
test and fix (if confirmed) once my MSDN subscription is renewed (in
process now, I expect it anytime).

Jeff