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Re: [Qemu-devel] [RFC] introduce bitmap to bdrv_commit to track dirty se

From: Zhang Haoyu
Subject: Re: [Qemu-devel] [RFC] introduce bitmap to bdrv_commit to track dirty sector
Date: Mon, 9 Mar 2015 16:14:38 +0800

Hi John, Vladimir 
We can using active block commit to implement incremental backup without guest 
origin <= A <= B <= C <= current BDS,
a new external snapshot will be produced before every time backup,
we can migrate A, B, C, ... to destination, 
then commit_active_start() the unneeded snapshot in source or destination end.

So, comparing with above mechanism,
what's the advantages of the incremental backup implemented by John and 

Zhang Haoyu

On 2015-03-09 15:38:40, Paolo Bonzini wrote:
>On 09/03/2015 08:03, Zhang Haoyu wrote:
>> On 2015-03-03 18:00:09, Paolo Bonzini wrote:
>>> On 03/03/2015 07:52, Zhang Haoyu wrote:
>>>> Hi,
>>>> If introducing bitmap to bdrv_commit to track dirty sector,
>>>> could we implement guest non-disruption while performing commit?
>>> That is already implemented.  It uses the same code that implements
>>> storage migration (block/mirror.c).
>> Hi Paolo,
>> do you mean commit_active_start()?

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