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From: Christiaan Willemsen <cwillemsen@technocon.com>
To: Joshua D. Drake <jd@commandprompt.com>
Cc: Merlin Moncure <mmoncure@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: How to setup disk spindles for best performance
Date: Thu, 21 Aug 2008 10:34:19 +0200
Message-ID: <48AD288B.8030902@technocon.com> (raw)
In-Reply-To: <48AD022E.7090400@commandprompt.com>
References: <972BDF1A-B4ED-46EC-B416-0CDF15A0439A@technocon.com>
	<b42b73150808201849t3577d65eq76e7484d8519af51@mail.gmail.com>
	<331B8FD1-7460-4B97-BD2C-03D8381E1C4D@technocon.com>
	<48AD022E.7090400@commandprompt.com>

Thanks Joshua,

So what about putting the indexes on a separate array? Since we do a lot 
of inserts indexes are going to be worked on a lot of the time.

Regards,

Christiaan

Joshua D. Drake wrote:
> Christiaan Willemsen wrote:
>> So, what you are basically saying, is that a single mirror is in 
>> general more than enough to facilitate the transaction log.
>
> http://www.commandprompt.com/blogs/joshua_drake/2008/04/is_that_performance_i_smell_ext2_vs_ext3_on_... 
>
> http://wiki.postgresql.org/wiki/HP_ProLiant_DL380_G5_Tuning_Guide
>
> And to answer your question, yes. Transaction logs are written 
> sequentially. You do not need a journaled file system and raid 1 is 
> plenty for most if not all work loads.
>
> Sincerely,
>
> Joshua D. Drake
>

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