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
