From: | Markus Schiltknecht <markus(at)bluegap(dot)ch> |
---|---|
To: | a(dot)mitani(at)sra-europe(dot)com |
Cc: | pgsql-docs(at)postgresql(dot)org, pgcluster-general(at)pgfoundry(dot)org, bruce(at)momjian(dot)us |
Subject: | Re: [Pgcluster-general] PostgreSQL Documentation of High Availability |
Date: | 2006-11-20 16:17:56 |
Message-ID: | 4561D534.1050502@bluegap.ch |
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Thread: | |
Lists: | pgsql-docs |
Hi,
a(dot)mitani(at)sra-europe(dot)com wrote:
> Current generation of PGCluster is a Shared-Nothing type of multi-master
> and syncronous replication system.
Thank you for pointing us to yet another very common distinction in the
clustering world: shared-nothing vs. shared-disk or even
shared-everything. We don't touch that in the current documentation. Do
we want or need to do so?
> I think that the feature of this type of replication system is as the
> 'Multi-Master Replication Using Clustering' chapter of your document.
Most probably, yes. Please note that it's not *my* document :-) Bruce
Momjian wrote most of it, with only some hints and annoying nit-picking
from my side.
> However, Oracle RAC is a Shared-Everything type of multi-master clustering
> system. If it set up appropriately, most of these limitations would be
> improved.
Shared-Everything, really? I thought they did their own distributed
shared memory or distributed locking stuff, so it would be shared-disk.
And together with their OCFS, they would reach shared-nothing. But I
don't really know.
@pgsql-docs: I'd strongly vote for not mentioning Oracle if we don't
event want to mention proprietary products for PostgreSQL. There are
enough research or ongoing projects (even some ongoing reserch projects
;-) ) to mention. PgCluster-II, GORDA, Slony-II or Postgres-R come to mind.
> Next generation of PGCluster (I named PGCluster-II) will be a
> Shared-Everything type of multi-master clustering system as demonstrated
> in Toronto.
Yeah, I remember that demonstration. Do you think PGCluster-II fits
what's described under 'Multi-Master Replication Using Clustering'? Do
you think we should explain Shared-Nothing vs. Shared-Disk vs.
Shared-Everything there?
Regards
Markus
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