δΊ 2013-7-17 17:42, Fam Zheng ει: > 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
