Sis to deduplicate attachments does not work?

[Daniel Miller]

On April 23, 2019 10:54:38 PM luckydog xf <luckydogxf at gmail.com> wrote:
> Is it worthwile to use dbox? seeing from 
> http://www.linuxmail.info/mbox-maildir-mail-storage-formats/ it may cause 
> file lock and easy to corrupt.
As with everything - it depends. You're asking me so these are *my* 
opinions - and I do not claim to be anything more than a hobbyist/tinkerer 
when the comes to this.

mbox has potential use for long term read-only archives - I see no reason 
to use it for live mailboxes.

maildir is undoubtedly the least susceptible to corruption. It's also the 
slowest format for reading. How slow is "slow" depends on your hardware - 
it may be imperceptible with enough RAM and SSD's - or it may result in 
user complaints with large mailboxes.

dbox is Dovecot's preferred format. I know Timo has put a lot of effort 
into it. sdbox is similar to maildir in that each mail is a separate file. 
mdbox significantly reduces the number of files which can make file-based 
backups faster. Both dbox formats are dependent on their index files.

If you've got good hardware, including a proper UPS, I'd recommend dbox (my 
server is presently using sdbox). With large mailboxes and file-based 
backups you'll benefit from mdbox. When reliability is the #1 concern above 
anything else - use maildir. Depending on your use SIS can have significant 
impact on storage requirements - but storage these days is relatively cheap.

I haven't seen much feedback from users actively using SIS - I'd love to 
hear from high traffic sites with SIS experience to know if the corruption 
issues have been resolved. In my case there was at least a 30% reduction in 
space but I had too many errors - admittedly it's been a couple years since 
I last tried it.

--
Daniel
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://dovecot.org/pipermail/dovecot/attachments/20190424/7a5694c4/attachment.html>