Il 2020-12-27 21:58 Zenon Panoussis ha scritto:
For such a project, I would simply configure the SMTP server do to
protocol-specific replication and use a low-TTL DNS name to publish
the IMAP/Web frontends.
Either you know something about mail servers that I would love
to know myself, or else this idea won't work. That's because
even if you could configure three SMTP servers as relays to
each-other (which you cannot), IMAP actions (move, delete etc)
do not propagate. So, one day you organise your mail nicely
in folders, next day you find all of it back in your inbox.
Or you go looking in your Sent folder for that mail you sent
last week, and it's just not there. That kind of thing would
probably frustrate everyone much more than a bit of latency.
Uhm yes, what I wrote was quite confusing. I was really referring to
something as that: https://wiki.dovecot.org/Replication
Re-reading your original question, I think geo-replication should work:
after all, if I understand it right, you would only use the
remote/backup copy in case the primary/local server goes down. Right?
However, you should carefully test if Gluster is, by itself, capable of
the load you are going to put over it: considering that a mailserver can
easily store millions of small files and Gluster relatively low file
lookup performance, I would thoroughly test it before putting this setup
into production.
About the closing consideration about a "bit of latency", I think you
are *way* over-optimistic for replica volumes: Gluster sync replication
is very latency boud and, if things did not changed recently, it was
strongly advised against running sync replication between WAN links.
Regards.
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Danti Gionatan
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