dovecot - Feb 2013 - move mail from server with v1.0 to server w. v2.1?

I'm about to replace my old server. Both servers are on my internal network.
The old one ist running debian lenny(32bit) with dovecot 1.0.15 and the 
new one debian Wheezy with dovecot 2.1.7.
I set up the users on both systems identically (same gid uid).
My first attempt was tho simply rsync the Maildirs along with the homes. 
Both deovecot versions are set up with the maildir format, but this 
results in ~30% doublicated mails on the new server.
I then learned about doveadm/dsync, only to figure out that this isn't 
available in v 1.0.15 and therefor won't work.
So which could be the most painless way to solve that?

Am 01.02.2013 17:22, schrieb Frank Lienhard:
> I'm about to replace my old server. Both servers are on my internal
network.
> The old one ist running debian lenny(32bit) with dovecot 1.0.15 and the new
one debian Wheezy with dovecot 2.1.7.
> I set up the users on both systems identically (same gid uid).
> My first attempt was tho simply rsync the Maildirs along with the homes.
Both deovecot versions are set up with the
> maildir format, but this results in ~30% doublicated mails on the new
server.
> I then learned about doveadm/dsync, only to figure out that this isn't
available in v 1.0.15 and therefor won't work.
> So which could be the most painless way to solve that?
imapsync is version agnostic and if you have a database
with the user-logins it should be easy to geenrate a shellscript

i did migration of around 200000 messages and some hundret users
from Apple OSX EIMS to dbmail/dovecot in 2009 this way

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Reindl Harald wrote:
> Am 01.02.2013 17:22, schrieb Frank Lienhard:
>   
>> I'm about to replace my old server. Both servers are on my internal
network.
>> The old one ist running debian lenny(32bit) with dovecot 1.0.15 and the
new one debian Wheezy with dovecot 2.1.7.
>> I set up the users on both systems identically (same gid uid).
>> My first attempt was tho simply rsync the Maildirs along with the
homes. Both deovecot versions are set up with the
>> maildir format, but this results in ~30% doublicated mails on the new
server.
>> I then learned about doveadm/dsync, only to figure out that this
isn't available in v 1.0.15 and therefor won't work.
>> So which could be the most painless way to solve that?
>>     
>
> imapsync is version agnostic and if you have a database
> with the user-logins it should be easy to geenrate a shellscript
>
> i did migration of around 200000 messages and some hundret users
> from Apple OSX EIMS to dbmail/dovecot in 2009 this way
>
>   
sadly, this is not availble from the debian repos.
I searched a bit around:
syncmaildir, imapsync: only available in in Lenny OR Wheezy, but needed 
on both servers
isync, mailsync: mentioned to hold two maildirs in sync with a more or 
less difficult to configure setup
which  leaves me one option (from programms I found);
offlineimap: mentioned to backup mails from a remote/ISP mailserver in a 
local directory of a user.
Wonder if that works , when the local dir is one of an imap server.......

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Hash: SHA1

On Fri, 1 Feb 2013, Frank Lienhard wrote:
> My first attempt was tho simply rsync the Maildirs along with the homes.
Both
> deovecot versions are set up with the maildir format, but this results in 
> ~30% doublicated mails on the new server.
Er, a) you got 30% more files on the new server (aka target), than you 
have on the old server (aka source)??

b) Or do you see them, when you login via IMAP to the the new server?

==
If a), did you ran rsync, while the source host is in production still? Do 
you use "H" option to preserve hardlinks and/or "--delete"
if you run
rsync multiple times?

If b), did you verified the duplication with a IMAP client, that does _no_ 
caching on its own or with a fresh and empty local cache / profile / ... .

Kind regards,

- -- 
Steffen Kaiser
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Steffen Kaiser wrote:
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> Hash: SHA1
>
> On Fri, 1 Feb 2013, Frank Lienhard wrote:
>
>> My first attempt was tho simply rsync the Maildirs along with the 
>> homes. Both deovecot versions are set up with the maildir format, but 
>> this results in ~30% doublicated mails on the new server.
>
> Er, a) you got 30% more files on the new server (aka target), than you 
> have on the old server (aka source)??
>
> b) Or do you see them, when you login via IMAP to the the new server?
>
> ==>
> If a), did you ran rsync, while the source host is in production 
> still? Do you use "H" option to preserve hardlinks and/or
"--delete"
> if you run rsync multiple times?
>
> If b), did you verified the duplication with a IMAP client, that does 
> _no_ caching on its own or with a fresh and empty local cache / 
> profile / ... .
>
I used -avu, where:
-a equals: -rlptgoD (no -H,-A,-X)
-u  skip file that are newer on the receiver

I stopped the getmail cronjob to ensure that no new messages get fetched 
while sync. After that I created a new account in Icedove and at first 
all went well, but after a while I got duoplicates of abou 900 old 
messages.
I admit I only looked that up from Icedove and not in the dir from cli.