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

[Jeff Cody]

On Sun, Jan 11, 2015 at 11:33:31PM -0500, Lokesha, Amulya wrote:
> Please find comments inline
> 
> -----Original Message-----
> From: address@hidden [mailto:address@hidden On Behalf Of Jeff Cody
> Sent: Wednesday, January 07, 2015 9:11 PM
> To: Lokesha, Amulya
> Subject: Re: [Qemu-devel] [Bug 1399191] [NEW] Large VHDX image size
> 
> 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
> 
> --
> 
> Hi Jeff,
> 
> Could you please give us a possible timeline of when fix will be
> available. Our customers are waiting on this as we are blocked with
> the image creation.
> 
> Thanks, Amulya

Hi Amulya,

I have my MSDN stuff sorted out now, so give me a day or two get my
test machine up and running & testing.

-Jeff
> 
> 
> You received this bug notification because you are subscribed to the bug 
> report.
> https://bugs.launchpad.net/bugs/1399191
> 
> Title:
>   Large VHDX image size
> 
> Status in QEMU:
>   New
> 
> Bug description:
>   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
> 
>   1. qemu-img convert -p -o subformat=fixed  -f vmdk -O vhdx Test.vmdk
>   Test-fixed.vhdx
> 
>   qemu-img info Test-fixed.vhdx
>   image: Test-fixed.vhdx
>   file format: vhdx
>   virtual size: 50G (53687091200 bytes)
>   disk size: 50G
>   cluster_size: 16777216
> 
> 
>   
>   2. qemu-img convert -p -o subformat=dynamic  -f vmdk -O vhdx Test.vmdk 
> Test-dynamic.vhdx
> 
>   qemu-img info Test-dynamic.vhdx
>   image: Test-dynamic.vhdx
>   file format: vhdx
>   virtual size: 50G (53687091200 bytes)
>   disk size: 50G
>   cluster_size: 16777216
> 
>   
>   We tried this with the following version of qemu
>   1. qemu-2.0.0
>   2. qemu-2.1.2
>   3. qemu-2.2.0-rc4
> 
>   
>   Please let us know how to create compact VHDX images using qemu-img.
>   Thank you
> 
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/qemu/+bug/1399191/+subscriptions

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https://bugs.launchpad.net/bugs/1399191

Title:
  Large VHDX image size

Status in QEMU:
  New

Bug description:
  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

  1. qemu-img convert -p -o subformat=fixed  -f vmdk -O vhdx Test.vmdk
  Test-fixed.vhdx

  qemu-img info Test-fixed.vhdx
  image: Test-fixed.vhdx
  file format: vhdx
  virtual size: 50G (53687091200 bytes)
  disk size: 50G
  cluster_size: 16777216


  
  2. qemu-img convert -p -o subformat=dynamic  -f vmdk -O vhdx Test.vmdk 
Test-dynamic.vhdx

  qemu-img info Test-dynamic.vhdx
  image: Test-dynamic.vhdx
  file format: vhdx
  virtual size: 50G (53687091200 bytes)
  disk size: 50G
  cluster_size: 16777216

  
  We tried this with the following version of qemu
  1. qemu-2.0.0
  2. qemu-2.1.2
  3. qemu-2.2.0-rc4

  
  Please let us know how to create compact VHDX images using qemu-img.
  Thank you

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