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Re: DRBD and Postgres: how to improve the perfomance?

From: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
To: Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>
Cc: Gregory Stark <stark(at)enterprisedb(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Bernd Helmle <mailings(at)oopsware(dot)de>, mfatticcioni(at)mbigroup(dot)it, pgsql-performance(at)postgresql(dot)org
Subject: Re: DRBD and Postgres: how to improve the perfomance?
Date: 2007-09-08 16:53:30
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Lists: pgsql-performance
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Stefan Kaltenbrunner wrote:
> Joshua D. Drake wrote:
>> Gregory Stark wrote:
>>> "Simon Riggs" <simon(at)2ndquadrant(dot)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 ....


Joshua D. Drake

> Stefan
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