On Wed Apr 24 2019 04:12:30 GMT-0400 (Eastern Standard Time), Daniel Miller via dovecot <dovecot@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.
