> On 17/10/2023 03:26 EEST Jan Bramkamp <cr...@rlwinm.de> wrote:
> 
>  
> On 16.10.23 13:17, Pedro Ribeiro via dovecot wrote:
> > Hello to everyone!
> > Ooops, we are using SIS, guess the solution for a similar optimization will 
> > be
> > a native deduplicated filesystem.
> 
> A block level de-duplicating filesystem can only deduplicate data that 
> is aligned to block boundaries. E-mail attachments tend to move around 
> in to a different alignment in each copy stored into a different 
> mailbox. Unless the storage format is designed to split off the 
> attachments into files there is not much to be gained by block level 
> dedup. So for the foreseeable future I'll have to stay off Dovecot 3.x 
> or add four to five times more storage to both my IMAP servers since my 
> users love to send big documents to multiple recipients.
> 
> Is this an attempt to figuring out the pain tolerance of existing users 
> before they fork the project or pay up the Danegeld?
> 

SIS won't be available even if you paid up the Danegeld. You can use 
mail_attachment_fs with posix driver.

Aki
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