Advice needed: Migration Dovecot to Kolab Cyrus.

[JP Horst]

I migrated to kolab3 on CentOS using imapsync.

imapsync --ssl1 --useuid --authmech1 PLAIN --ssl2 --authmech2 PLAIN --host1 
10.76.25.x --user1 x at y.de --passfile1 /root/migrate/pass_x --host2 10.76.25.y 
--user2 xy --passfile2 /root/migrate/pass_xy

Unfortunately imapsync with kolab3 is extremely slow. With kolab 2 I 
remembered it much faster. A big mailbox with 10 GB can take a day or more to 
sync. (Message rate: 0.2 messages/s, Average bandwidth rate: 70.0 KiB/s)


I applied 3 steps:

1. dryrun to see if all subfolders get synchronized. Due to errors I had users 
to rename some folders

2. Initial sync during productive use, which took several days.

3. Final sync during swichting without productive use in the background. Since 
the bulk of the mails is already transferred this third step will be quicker 
and downtime shorter.

As a consequence there might be some mails doubled, but that should not be a 
big problem.

Good luck
JP




Am Mittwoch, 20. März 2013, 09:56:32 schrieb Winfried Ritsch:
> Hello,
> 
>  I set up a new Kolab 3.0 on Debian wheezy and I am quite a newbie on this.
> (Thanks for this work, I installed it on a fresh server setup quite nicely
> and it is working quite well, with some problems, not urgent needed.) Now I
> want to switch to the new server:
> 
> 
>  What tools to use for migration of maildirs from exim/dovecot to Kolab 3 ?
> 
> 
> Here my try:
> 
>  - I created same users on Kolab, adjusting the uid so login should be the
> same,
> 
>  I used imapsync from Fedora free source: https://fedorahosted.org/imapsync/
> 
>  with options:
>   --tls1 --tls2 --syncinternaldates --delete2  --noexpunge --subscribe
> 
>   (no --delete2folders since it would erase default folders of Kolab)
> 
> Since mailboxes are quite big, I did a pre-sync during running system. after
> that during switching (exim mailserver down, firewall blocked imap) I did a
> new sync:
>   - some of mails where doubled, folder structure was broken.
> 
> on this new imapsync a lot of mails are copied again, which will take more
> then 8 hours, to long for a mailserver downtime.
> 
> So now I switched back to old sever before completing.
> 
> Like stated before: Has anyone a hint how it could be done more smoothly ?
> 
> mfg
>  Winfried Ritsch
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