I Agree with Robert but i never heard of Cybercluster before.
Does anyone have any experience with Cybercluster? It sounds really
interesting!
Best regards,
Mathias Stjernström
http://www.pastbedti.me/
On 22 aug 2008, at 08.18, RW wrote:
>
>> My company finally has the means to install a new database server
>> for replication. I have Googled and found a lot of sparse
>> information out there regarding replication systems for PostgreSQL
>> and a lot of it looks very out-of-date. Can I please get some
>> ideas from those of you that are currently using fail-over
>> replication systems? What advantage does your solution have? What
>> are the "gotchas" I need to worry about?
>>
>> My desire would be to have a parallel server that could act as a
>> hot standby system with automatic fail over in a multi-master
>> role. If our primary server goes down for whatever reason, the
>> secondary would take over and handle the load seamlessly. I think
>> this is really the "holy grail" scenario and I understand how
>> difficult it is to achieve. Especially since we make frequent use
>> of sequences in our databases. If MM is too difficult, I'm willing
>> to accept a hot-standby read-only system that will handle queries
>> until we can fix whatever ails the master.
>> We are primary an OLAP environment but there is a constant stream
>> of inserts into the databases. There are 47 different databases
>> hosted on the primary server and this number will continue to scale
>> up to whatever the server seems to support. The reason I mention
>> this number is that it seems that those systems that make heavy use
>> of schema changes require a lot of "fiddling". For a single
>> database, this doesn't seem too problematic, but any manual work
>> involved and administrative overhead will scale at the same rate as
>> the database count grows and I certainly want to minimize as much
>> fiddling as possible.
>>
>>
> If you really need "only" need automatic failover than use DRBD +
> Heartbeat
> somebody already mentioned. We are using this solution since 3 years
> now.
> With DRBD replication is done at filesystem block level. So you
> don't have to
> bother about changes done with a DDL statement and Heartbeat will
> automatically failover if one server goes down. It's really stable.
>
> If you want MM you should give Cybercluster a try. (http://www.postgresql.at/english/pr_cybercluster_e.html
> )
> They offer good support and is Open Source since a few month now.
>
> Robert
>
>
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