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/70df8f39fb3db7c49b18c855178f8172176a0...

On 29 Jan 2016, at 00:02, Petr Bousek aba@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