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From: Juan Quintela <quintela@redhat.com>
In-Reply-To: <4C8D1339.2000803@redhat.com> (Avi Kivity's message of "Sun, 12
	Sep 2010 19:51:53 +0200")
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Date: Wed, 15 Sep 2010 18:00:07 +0200
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Subject: [Qemu-devel] Re: [PATCH 1/3] block: allow migration to work with
	image	files
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To: Avi Kivity <avi@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, qemu-devel@nongnu.org, Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

Avi Kivity <avi@redhat.com> wrote:
>  On 09/12/2010 07:10 PM, Anthony Liguori wrote:
>> On 09/12/2010 11:06 AM, Avi Kivity wrote:
>>>  On 09/12/2010 05:26 PM, Anthony Liguori wrote:
>>>> On 09/12/2010 08:28 AM, Avi Kivity wrote:
>>>>>  On 09/12/2010 03:06 PM, Anthony Liguori wrote:
>>>>>>
>>>>>> Backing files and logical size shouldn't change during live
>>>>>> migration.
>>>>>
>>>>> Why not?
>>>>
>>>> To make our lives easier.
>>>
>>> It means management needs to block volume resize while a live
>>> migration takes place.  Since live migration is typically done by
>>> the system automatically, while volume resize happens in response
>>> to user request, this isn't a good idea.  Both in terms of user
>>> experience, and in terms of pushing more complexity to management.
>>
>> We don't do volume resize today so it's a moot point.
>>
>
> Let's be prepared for the future.

This is better done when we would be able to create the machine during
migration.  As we have everything organized today, this is basically
imposible :(

The problem is not related with live migration, is related with the fact
that we need to give the same arguments in both source & target machines.

Later, Juan.