From: Joshua D. Drake <jd@commandprompt.com>
To: Chris Ruprecht <chris@ruprecht.org>
Cc: Francisco Reyes <lists@stringsutils.com>
Cc: Pgsql performance <pgsql-performance@postgresql.org>
Subject: Re: RAID controllers for Postgresql on large setups
Date: Mon, 12 May 2008 21:40:15 -0700
Message-ID: <48291BAF.1040807@commandprompt.com> (raw)
In-Reply-To: <87F7C977-3160-42BC-98CF-5271B972C0D9@ruprecht.org>
References: <cone.1210644243.416947.84940.1000@zoraida.natserv.net>
<20080512191118.1b40324b@jd-laptop>
<87F7C977-3160-42BC-98CF-5271B972C0D9@ruprecht.org>
Chris Ruprecht wrote:
> Joshua,
>
> did you try to run the 345 on an IBM ServeRAID 6i?
No the only controllers I had at the time were the 2120 and the LSI on
board that is limited to RAID 1. I put the drives on the LSI in JBOD and
used Linux software raid.
The key identifier for me was using a single writer over 6 (RAID 10)
drives with the 2120 I could get ~ 16 megs a second. The moment I went
to multiple writers it dropped exponentially.
However with software raid I was able to sustain ~ 16 megs a second over
multiple threads. I stopped testing at 4 threads when I was getting 16
megs per thread :). I was happy at that point.
Joshua D. Drake
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To: pgsql-performance@postgresql.org
Cc: jd@commandprompt.com, chris@ruprecht.org, lists@stringsutils.com
Subject: Re: RAID controllers for Postgresql on large setups
In-Reply-To: <48291BAF.1040807@commandprompt.com>
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