[Dovecot] Dovecot 1.x on AIX -> Dovecot 2.x on Ubuntu

[Daniel Parthey]

root at yuma.acns.colostate.edu wrote:
> We are working on migrating Dovecot 1.2.17 running on AIX 5.3 (believe it
> or not!) to Dovecot 2.0.13 running on Ubuntu.  We have hundreds of users
> mboxes we will be migrating.  My question is regarding the index files.
> Should we remove those after the migration, but before we open it up to
> users so Dovecot can create new ones?
> 
> I did a test migration of a single user, and Dovecot detects the
> architecture change and put out some panic errors, corrupt files and
> backtrace messages in syslog on Ubuntu.  The messages are shown below.  If
> every user is going to generate these types of errors, I'm thinking maybe
> it makes sense to remove all the .imap directories and let Dovecot create
> new clean ones.  I realize that may slow things down for awhile while
> Dovecot is rebuilding new files.

Which mail storage format (mbox,maildir,sdbox,mdbox)
are you using and is it stored on NFS?

Would you provide your "doveconf -n" output for dovecot 2.0.13, please?

You might also have a look at imapsync[1] for clean mass migration
from one architecture to another.

Regards
Daniel

[1] http://imapsync.lamiral.info/