dovecot - Sep 2013 - Migrating from dovecot 2.1 to 2.2

Due to the incompatibilities with the dsync protocol version between 2.1
and 2.2, I am unable to use dsync to move users to a new machine where
we have 2.2.5 setup. This wouldn't normally be a problem, as I could
just rsync the user's mdbox and dovecot would happily do the right
thing. However, on the new system I've placed the indexes into a faster
storage medium, where on the older system the indexes were included in
their mail directory.

I can rsync over the entire thing, including their old indexes, and
dovecot will try to do the right thing and build new indexes, but what
happens is all mail is marked as unread, and I get some old index cruft
left around in the directories.

How can I preserve the seen/unseen flags in such a migration? 

Thanks!
micah

On 2013-09-13 12:07 PM, Micah Anderson <micah at riseup.net>
wrote:
> Due to the incompatibilities with the dsync protocol version between 2.1
> and 2.2, I am unable to use dsync to move users to a new machine where
> we have 2.2.5 setup. This wouldn't normally be a problem, as I could
> just rsync the user's mdbox and dovecot would happily do the right
> thing. However, on the new system I've placed the indexes into a faster
> storage medium, where on the older system the indexes were included in
> their mail directory.
You could either simply upgrade the 2.1 server to 2.2 (that looks to me 
to be the simplest/best option), or, I believe I recall reading that you 
can install 2.2 in a separate location, and use the dsync in 2.2 on the 
2.1 server...?

-- 

Best regards,

*/Charles/*

Hey there micah,

assuming you have your Dovecot set up using virtual users, I would advise you to
use imapsync for that. It does incremental and recursive IMAP transfers from one
mailbox to another (on different servers too). As it doesn't make a file
copy, but let the two dovecot servers talk directly to each other via IMAP, all
your mails with all flags, dates etc. will be preserved on the destination
system exactly like on your source system.
In your case also the indexes will be written on the fast system automatically
by Dovecot 2.2.5 (if configured to do so), so this might do exactly what you are
looking for.

I have myself successfully transferred over 35000 accounts with imapsync (with
very few problems, almost all of them because of corrupt mailboxes or special
character encoding problems occured through former use of weird obsolete mail
clients) and can highly recommend it.

Best regards and good luck,
Megodin




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