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Re: Warm standby server

From: "Scott Whitney" <swhitney(at)journyx(dot)com>
To: "'Montaseri'" <montaseri(at)gmail(dot)com>,"'Simon Riggs'" <simon(at)2ndquadrant(dot)com>
Cc: <pgsql-admin(at)postgresql(dot)org>
Subject: Re: Warm standby server
Date: 2008-06-26 18:01:03
Message-ID: 20080626175743.4E1B33E216E@mail.int.journyx.com (view raw or flat)
Thread:
Lists: pgsql-admin
Fully agreed, and it's just a concept at the moment. After I have a
prototype standby working next week in the first place, we'll be discussing
those very merits.

A 2nd question: Is it possible to have 2 standby servers with a single
master duplicating to standby1 (at my coloc), and standby2 (at my office)?
Assume no auto-failover.

-----Original Message-----
From: Montaseri [mailto:montaseri(at)gmail(dot)com] 
Sent: Jun 26, 2008 12:51 PM
To: Simon Riggs
Cc: Scott Whitney; pgsql-admin(at)postgresql(dot)org
Subject: Re: [ADMIN] Warm standby server

I am not so sure of this arrangement's mertis

From HA (High Availability) point of view, the host/server is a single point
of failure which will bring your entire infrastructure down if any of the
server hardware components fail.

From Performance point of view, you have increased the load on your server
by 3 folds as all instances would be using your I/O bandwidth to write to
secondary storage

Given $300 to $400 price of headless servers these days, its much economical
to split the workload on three boxes

Cheers
Medi


On Thu, Jun 26, 2008 at 9:06 AM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:



	On Thu, 2008-06-26 at 10:19 -0500, Scott Whitney wrote:
	> I've got 3 different database servers (db01, db02 and db03).
	>
	> I would like to have a WAL standby server that replays logs for
all 3 in
	> case one goes down, so I can promote that particular server.
	>
	> Can I do this by installing 3 separate postmasters on this
machine?
	> Obviously, if 2 went down at the same time, I'd have to do some
magic to
	> bring up another machine, but I'm not sure that's a concern.
	
	
	Yes, that will work.
	
	--
	 Simon Riggs           www.2ndQuadrant.com
	 PostgreSQL Training, Services and Support
	


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