Sis to deduplicate attachments does not work?

[luckydog xf]

It seems Maildir is the safest mail format right now, as long as you could
accept little performance and disk cost penalty.



On Wed, Apr 24, 2019 at 9:01 PM Tanstaafl via dovecot <dovecot at dovecot.org>
wrote:

> On Wed Apr 24 2019 04:12:30 GMT-0400 (Eastern Standard Time), Daniel
> Miller via dovecot <dovecot at dovecot.org> wrote:
> > 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.
>
> My plan when I roll out my new server this year is to use mdbox, but put
> the indexes and other important meta data on a smallish volume using
> either ZFS or BTRFS, for the automatic self-healing capabilities (and
> the ability to expand it if necessary).
>
> This pretty much eliminates the worry about data loss from index file
> corruption.
>
> > 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.
>
> I never tried it because of the problems with respect to backup/restore,
> and if I'm not mistaken, those problems have not been resolved.
>
> Maybe its a design issue...
>
> Or maybe it just isn't a high enough priority, like the missing
> x-original-to header in the LMTP code that will still prevent me from
> being able to use the otherwise much better LMTP delivery agent.
>
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