Maildir to mdbox conersion size issue

[Timo Sirainen]

Same mail existed in multiple folders (was copied). dsync duplicates the mails by default. You could deduplicate with -a parameter: https://github.com/dovecot/core/commit/70df8f39fb3db7c49b18c855178f8172176a037a

> On 29 Jan 2016, at 00:02, Petr Bousek <aba at sundown.cz> wrote:
> 
> I have some new info:
> 
> the original Maildir size was 24GB
> 
> after conversion to mdbox it was 48GB
> 
> today I tried to convert it back to Maildir and it was 39GB
> 
> So what's wrong?
> 
> Zlib wasn't used in any step.
> 
> Petr
> 
> On 27.1.2016 21:34, Petr Bousek wrote:
>> Hello,
>> 
>> I have issue with dovecot 2.2.13
>> 
>> I want to change all Maildirs to mdbox format and I do it per partes, so I change mail_location for user (in sql), than I use doveadm sync -u user path_to_maildir and everything works mostly fine.
>> 
>> But now I found that when I migrate quite huge Maildir (about 24G of mails) to mdbox, after sync the final mdbox is twice as big as source Maildir (48GB). I tried to find duplicities, but didn't find any.
>> 
>> Is there any reason why mdbox consume so much data? Or I do something wrong?
>> 
>> Does somebody have same experience?
>> 
>> Thanks
>> 
>> Petr