[Podman] Re: Including file system changes in container migration

On Fri, Jun 21, 2019 at 06:09:31PM +0200, Adrian Reber wrote:

One reason I am not convinced that 'diff' is the right approach is if only 1 byte is changed in a large file. I hope that overlay is smart enough to only store the diff of the changed block (if that is how overlay works). Using 'diff' probably the complete large file has to be transferred even if only 1 byte changes.

Overlay works at the level of whole files. Layer blobs that are used when transporting and storing images also include whole files, because they're .tar archives. HTH, Nalin