Re: [Xen-API] vhdx support ?

[Sébastien Riccio <sr@xxxxxxxxxxxxxxx>]

Hi Mike,

Thanks for your reply. Well yes vhdx is very new, it is not yet released 
as it's part of the windows 8 server hyper-v layer which is currently  
in beta as far as I know. But still this is very interesting and I am a 
bit worried that windows 8's hyper-v is going to take a big step ahead 
of other virtualisations solutions.
I love Xen and XCP but I must admit that they've implemented really nice 
features...
I don't think there is any vhdx open source implementation yet. I 
thought there was a partnership between citrix and microsoft, but maybe 
I'm wrong.
Still there is the technical specification document available on ms site:

http://www.microsoft.com/en-us/download/details.aspx?id=29681

If your storage team want to take a look at it.

Cheers,
Sébastien


On 07.06.2012 10:35, Mike McClurg wrote:
> On 01/06/12 23:29, Sébastien Riccio wrote:
> > Hi,
> >
> > I don't know where this question should be posted, but I'll try here.
> >
> > Is there any plan for XenServer/XCP/Kronos to support the vhdx format
> > that should get rid of the 2tb limit for a single volume ?
> >
> > As seen somewhere on the interweb:
> >
> > Now with VHDX Microsoft kills this limitations and brings some other
> > improvements:
> >
> >   * Supports up to 16TB size
> >   * Supports larger block file size
> >   * improved performance
> >   * improved corruption resistance
> I just spoke to our storage team dev lead about this. The short answer 
> is that we want to support it, but we don't have any plans for it in 
> the short term.
> The real benefits we would get out of VHDX would be breaking the 2TB 
> limit, and potential performance improvements. Modifying our current 
> VHD implementation might let us do that, without actually implementing 
> VHDX. Perhaps QCOW images might allow disks bigger than 2TB, but I 
> don't really know.
> The biggest issue with implementing VHDX is that we don't know of any 
> existing, open-source implementation of it, which means that we would 
> have to invest a lot of time to write our own from scratch. If anyone 
> knows of any existing VHDX implementations that we can use, I'm sure 
> the storage team would like to hear about it!
> Mike

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