You are looking at two different capabilities: Replication, Fallover.
The Replication would be done with the database.
Then Fallover would be done through some other system which would
redirect the smtp or pop request to an available service. You might
want to check out Wackamole:
http://www.backhand.org/wackamole/
jbw
armin langhofer wrote:
hi hans, hi jbw
i read the first terms of the drbd howto.
the problem i figured out is, that dbmail would store the new mails only
on one host and if that host fails the "secondary" host can not store
the data.
the same is for postgres-r, jbw
i was looking for a solution which gives me the advantage of a
transparent mail system where the user even doesnt notice that one host
fails. pop and smtp should continue as both hosts were up.
so what i am looking for is a way of doubling the data with
"master-capabilities" on both hosts. lets call it a 2-way replication
system where both hosts are able to write the data into the db.
any ideas?
armin.
Hans Kula schrieb:
hi armin,
maybe you should take a look at
http://www.complang.tuwien.ac.at/reisner/drbd/
This is good way for mysql 3.23.xx.
Another way for mysql 3.23.xx is to use a circular master/slave
relationship...
but its not my favorite solution...
regards hans
-----------------------------
PostgreSQL does not currently support replication. There are a couple
trigger based solutions that provide master-slave or peer-peer
operation, but these all provide Lazy syncronization.
The few integrated solutions only work in Master-Slave operation now.
The project that I am following is Postgres-R. It uses Ensamble or
Spread to provide group communication, and will eventually provide Peer
to Peer Eager sync. But currently they have only managed Master to Many
Slave Eager sync, though they don't seem to be too far away from Master
to Master.
http://gborg.postgresql.org/project/pgreplication/projdisplay.php
Page with links to other projects:
http://gborg.postgresql.org/genpage?replication_research
jbw
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