On Wed, 2013-04-10 at 18:59 +0200, Thomas Hummel wrote: > On Wed, Apr 10, 2013 at 06:28:47PM +0200, Thomas Hummel wrote: > > > So basically, it works as with conventional data moved with rsync in 2 > > phases > > (initial copy and sync of the (hopefully small) reminder to minimize > > «downtime» > > or incomplete state except that dsync is used to have the mailbox format and > > dovecot knowledge, right ? > > Isn't there still a critical section : new imap connections could be created > (if auth is not denied temporary for this user) while the final sync still to > be finished or started ?
Not if you kick the users out at the correct time: - dsync - switch user to new format - kick users - final dsync It doesn't matter if new connections arrive during the final dsync, because they are using the new format already. dsync merges changes, it doesn't destroy any changes.