Re: Migrate postgres to newer hardware

Greg,

I am going to gather the figures about our database and I will email to the list, if I am allowed to.
Number of tables, number of transactions per day etc.

Nothing on our db servers are optimized, hardware wise, the db is on the same volume as logs as the os.
I know we have an IO problem because I have been checking it and it has been growing steadily.
We must migrate to newer and better optimized hardware.

Thank you again

Much appreciated.

Renato

Renato Oliveira
Systems Administrator
e-mail: renato(dot)oliveira(at)grant(dot)co(dot)uk

Tel: +44 (0)1763 260811
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Grant Instruments (Cambridge) Ltd

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-----Original Message-----

From: Scott Marlowe [mailto:scott(dot)marlowe(at)gmail(dot)com]
Sent: 31 March 2010 09:11
To: Renato Oliveira
Cc: Greg Smith; Tino Schwarze; pgsql-admin(at)postgresql(dot)org
Subject: Re: [ADMIN] Migrate postgres to newer hardware

On Wed, Mar 31, 2010 at 1:43 AM, Renato Oliveira
<renato(dot)oliveira(at)grant(dot)co(dot)uk> wrote:
> Greg,
>
> Thank you very much for your input.
> I agree with you and I do understand where you are coming from.
>
> I do agree that in order to transition without a noticeable downtime the application would need to be built for that.
>
> Which one works best: bucardo, slony or Londiste?
>
> I have researched Slony and Bucardo but have not heard of Londiste before.
>
> How many people are using all three of them and their review have you heard anything about that?

I run slony. On our regular db there are about 2000 relations, about
1200 of those are indexes, so slony has to worry about 800 or so
relations. It has no problem with that. On another machine that has
some 45k relations in addition to the 2000 base relations. That slony
instance takes 3.5 hours to run the same create set that takes 2
minutes on the machine with just 2000 relations.

Slony should be able to work for you. See if you can schedule it so
you start your subscription right when you're entering your lowest
throughput window. Your real bottleneck here is that source database
with a single hard drive. That's going to limit your speed of
subscription by quite a bit.

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