The cleanest (though not necessarily simplest) way to go about this would be to use dsync to create a new maildir and incrementally direct traffic to a separate Dovecot instance.
Unless you have a legacy application that relies on maildir, switching to mdbox would be a good idea too. I expect that with Dovecot compression is something that can "just be turned on", but for fear of any possible issue, I chose to migrate mailboxes in batches with the way mentioned above. On Dec 24, 2011, at 7:20 AM, Jan-Frode Myklebust wrote: > I've just enabled zlib for our users, and am looking at how to compress > the existing files. The routine for doing this at > http://wiki2.dovecot.org/Plugins/Zlib seems a bit complicated. What do > you think about simply doing: > > find /var/vmail -type f -name "*,S=*" -mtime +1 -exec gzip -S Z -6 '{}' > + > > > I.e. find all maildir-files: > > - with size in the name ("*,S=*") > - modified before I enabled zlib plugin > - compress them > - add the Z suffix > - keep timestamps (gzip does that by default) > > > It's of course racy without the maildirlock, but are there any other > problems with this approach ? > > > -jf
