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Re: [Qemu-devel] [PATCH v2 00/11] Point-in-time snapshot exporting over

From: Wenchao Xia
Subject: Re: [Qemu-devel] [PATCH v2 00/11] Point-in-time snapshot exporting over NBD
Date: Tue, 23 Jul 2013 09:52:48 +0800
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130620 Thunderbird/17.0.7

于 2013-7-19 18:41, Wenchao Xia 写道:
> 于 2013-7-17 17:42, Fam Zheng 写道:
>> This series adds for point-in-time snapshot NBD exporting based on
>> blockdev-backup (variant of drive-backup with existing device as target). 
>> This
>> patch is built on top of imain's sync mode patches for drive-backup.
>> We get a thin point-in-time snapshot by COW mechanism of drive-backup, and
>> export it through built in NBD server. The steps are as below:
>    Compared with driver-backup, this approach is more flexible in some way,
> since user can read the content and copy out what he need, with a
> sacrifice of write of old data to temporary file. Overall it seems good.
>    Dirty change tracking is what miss for a full solution, which
> naturally exist in backing chain snapshot.
  Any one is doing dirty tracking feature? If no, I'd like to draft a
version based on add-cow.

Best Regards

Wenchao Xia

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