From: Joshua D. Drake <jd@commandprompt.com>
To: Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>
Cc: Gregory Stark <stark@enterprisedb.com>
Cc: Simon Riggs <simon@2ndquadrant.com>
Cc: Bernd Helmle <mailings@oopsware.de>
Cc: mfatticcioni@mbigroup.it
Cc: pgsql-performance@postgresql.org
Subject: Re: DRBD and Postgres: how to improve the perfomance?
Date: Sat, 08 Sep 2007 09:53:30 -0700
Message-ID: <46E2D38A.6070607@commandprompt.com> (raw)
In-Reply-To: <46E2CEF3.1030908@kaltenbrunner.cc>
References: <2C070D1C3970467FF64F6B6A@imhotep.credativ.de>
<1189232904.4281.19.camel@ebony.site>
<87k5r1zd52.fsf@oxford.xeocode.com>
<46E2CAAF.50205@commandprompt.com>
<46E2CEF3.1030908@kaltenbrunner.cc>
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Stefan Kaltenbrunner wrote:
> Joshua D. Drake wrote:
>> Gregory Stark wrote:
>>> "Simon Riggs" <simon@2ndquadrant.com> writes:
>>>> You're right, but the distinction is a small one. What are the chances
>>>> of losing two independent servers within a few milliseconds of each
>>>> other?
>>> If they're on the same power bus?
>> That chance is minuscule or at least should be. Of course we are
>> assuming some level of conditioned power that is independent of the
>> power bus, e.g; a UPS.
>
> how is that making it different in practise ? - if both are on the same
> UPS they are affectively on the same power bus ...
Well I was thinking the bus that is in the wall. I would assume that
people were smart enough to have independent UPS systems for each server.
city power->line conditioning generator->panel->plug->UPS->server
wash, rinse repeat.
> If the UPS fails (or the generator is not kicking in which happens way
> more often than people would believe) they could still fail at the very
> same time ....
Sincerely,
Joshua D. Drake
>
>
> Stefan
>
> ---------------------------(end of broadcast)---------------------------
> TIP 4: Have you searched our list archives?
>
> http://archives.postgresql.org
>
- --
=== The PostgreSQL Company: Command Prompt, Inc. ===
Sales/Support: +1.503.667.4564 24x7/Emergency: +1.800.492.2240
PostgreSQL solutions since 1997 http://www.commandprompt.com/
UNIQUE NOT NULL
Donate to the PostgreSQL Project: http://www.postgresql.org/about/donate
PostgreSQL Replication: http://www.commandprompt.com/products/
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
iD8DBQFG4tOKATb/zqfZUUQRAiSTAJ4pqQqsP7aH9GPJYjY3hZDvKzU8cACeKKJ3
wAae0tl2XswsjgEncIsOBlw=
=xsGZ
-----END PGP SIGNATURE-----
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: jd@commandprompt.com, stefan@kaltenbrunner.cc, stark@enterprisedb.com, simon@2ndquadrant.com, mailings@oopsware.de, mfatticcioni@mbigroup.it
Subject: Re: DRBD and Postgres: how to improve the perfomance?
In-Reply-To: <46E2D38A.6070607@commandprompt.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox