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

[Wenchao Xia]

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.

> 


-- 
Best Regards

Wenchao Xia