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Re: Cluster/Replication

From: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
To: Sean Brown <sbrown(at)eaglepress(dot)com>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: Cluster/Replication
Date: 2007-10-19 17:06:26
Message-ID: 20071019100626.09fd9e13@scratch (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
On Fri, 19 Oct 2007 12:43:40 -0400
Sean Brown <sbrown(at)eaglepress(dot)com> wrote:

> I believe this has come up before, and I am still researching how to  
> do this and figured asking was probably a good idea as hopefully I  
> can either get some direction or someone can point me at something I  
> haven't seen yet.

Why do you have a synchronous requirement?

> We are setting up a new database system that is going to act as our  
> central database. We are planning to have a Master/Slave setup,  
> originally with one slave but there is a strong possibility of
> adding a second slave at our second site. We could run Mulit-Master,
> it just wasn't the original plan. (The original plan was MySQL log
> shipping). We do not want the possibility of loosing data in the
> event of loosing the master node so synchronous replication is
> preferable. We are using BLOBS, so the replication has to be able to
> handle that. The slave we want to have useable but it would be used
> for reporting only under normal usage.
> Slony is out because of the BLOB requirement and it's asynchronous.  
> We are looking at pgCluster, but the replication server looks like a  
> single point of failure itself. Also we're not really clear on how  
> the replication server or load balancer operates for determining the  
> load and size of the system it would have to run them on.
> There are a few other things like how to handle postgresql version  
> upgrades but thats probably best left to specific forums once a  
> solution is chosen.
> Is pgCluster the way to go or are there other projects we might want  
> to look at?
> Thank you in advance.
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