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Date: Fri, 17 Jun 2011 07:21:31 -0500
From: Anthony Liguori <aliguori@us.ibm.com>
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Subject: Re: [Qemu-devel] Image streaming and live block copy
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To: Kevin Wolf <kwolf@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>, agl@linux.vnet.ibm.com, Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>, jes sorensen <jes.sorensen@redhat.com>, Dor Laor <dlaor@redhat.com>, qemu-devel@nongnu.org, Avi Kivity <avi@redhat.com>

On 06/17/2011 03:36 AM, Kevin Wolf wrote:
> Am 16.06.2011 16:52, schrieb Marcelo Tosatti:
>> On Thu, Jun 16, 2011 at 03:08:30PM +0200, Kevin Wolf wrote:
>> Over this scheme, you'd have:
>>
>> 1) Block copy.
>> Reopen image to be copied with
>> blkstream:/path/to/current-image:/path/to/destination-image,
>> background read sectors 0...N.
>>
>> 2) Image stream:
>> blkstream:remote-image:/path/to/local-image,
>> background read sectors 0...N.
>>
>> Where remote-image is remote accessible image such as NBD.
>
> I think that should work.
>
> By the way, we'll get problems with the colon syntax. Without -blockdev
> we'll have to invent a new syntax, maybe with brackets:
>
> blkstream:[nbd:localhost]:out.qcow2

So what's the main issue with -blockdev today?  Just need someone to 
spend some time implementing it?

Also, it would be a useful exercise to try and capture some of this in 
the wiki.  That makes it a bit easier to reference as we move forward.

Regards,

Anthony Liguori

> Kevin