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Re: multiple replication scenarios questions
Guillaume Rousse wrote:
> Hello list.
> I had a look at section 18 of the admin manual, as I was trying to
> figure difference between scenarios 18.2.2 (N-way multi-master) and
> 18.2.3 (mirror mode). Whereas the descriptions of both scenarios are
> quite clear, given examples configuration are quite confusing (at least
> for me).
> First, they are quite hard to compare, as the first one uses LDIF
> syntax, whereas the second uses the classical file configuration syntax.
> Second, they both use the same directives:
> - a different serverId for each nodes
> - mirrormode on for each nodes
> - syncrepl directives for each nodes
> The only difference being than for multi-master, each node has syncrepl
> directives for each nodes (including himself), whereas for mirrror mode,
> each node only has syncrepl directives for other nodes. But it's hard to
> figure if that's because of the replication scenario, or just because in
> the first case, the configuration has to be identical everyhwere given
> that it's replicated automatically.
> So, what is supposed to be different at configuration level between
> those two scenarios ?
> Additonal question: doesn't a classical single-master + multiple slaves
> scenarios, where each slave use chain overlay to automatically forward
> all changes to the master, also achieve exactly what is described in the
> mirror mode description ?
Without the mirrormode feature you won't get automatic failover and recovery
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/