Yes, but it is very difficult, the trick is to get it done as close to instant as possible, for example you can upload your updated site to a different folder, then move the folder with the old files and then move the new files into place, a move command is very very fast and if done in a shell script can get your entire site replaced and updated in a tiny fraction of a second
the other option that you can use if your site uses multiple servers is to redirect all traffic to one server and update the other, then move all the traffic to the updates server and work on the other.
-- This message may have been cut off and the rest will only be shown to members. To become a member, click here --