On Thu, Nov 22, 2018 at 05:15:53PM +0100, Ansgar Burchardt wrote:
Moving files around in such a matter that they are still available in the old location (via a symlink) is not a very invasive change, so there is only a small risk of problems. That matches what was reported so far.
That's not actually what happens: the files are still available in the old location *if and only if the process is fully successful*. If there are any issues you have a partially migrated system in which the files are *not* still available in the old location, and which cannot be reverted back to the original state.