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Re: [Qemu-devel] iotest 194 fails on vhdx

From: Jeff Cody
Subject: Re: [Qemu-devel] iotest 194 fails on vhdx
Date: Fri, 3 Nov 2017 08:38:40 -0400
User-agent: Mutt/1.5.24 (2015-08-30)

On Thu, Nov 02, 2017 at 12:19:00PM +1100, Alexey Kardashevskiy wrote:
> On 28/10/17 19:25, Paolo Bonzini wrote:
> > On 28/10/2017 08:57, Alexey Kardashevskiy wrote:
> >> On 27/10/17 18:12, Jeff Cody wrote:
> >>> VHDX does not support migration (VMDK fails the same way). 
> >>
> >> Probably a very ignorant question but how can an image format not support
> >> migration at all? Is not it simple writing blocks, one-by-one? Thanks.
> > 
> > VHDX does not implement bdrv_invalidate_cache.  If you add that
> > callback, it can support migration.
> I could give it a try but is there a demand for it really?

I don't think there is much demand for it, which is why we use the
migration-blocker for it still.  VHDX is a compatibility format, and as such
I don't imagine many people using it as a primary format during runtime.

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