From: Joshua D. Drake <jd@commandprompt.com>
To: 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 19:11:18 -0700
Message-ID: <20080512191118.1b40324b@jd-laptop> (raw)
In-Reply-To: <cone.1210644243.416947.84940.1000@zoraida.natserv.net>
References: <cone.1210644243.416947.84940.1000@zoraida.natserv.net>
On Mon, 12 May 2008 22:04:03 -0400
Francisco Reyes <lists@stringsutils.com> wrote:
> Inheritted a number of servers and I am starting to look into the
> hardware.
>
> So far what I know from a few of the servers
> Redhat servers.
> 15K rpm disks, 12GB to 32GB of RAM.
> Adaptec 2120 SCSI controller (64MB of cache).
>
> The servers have mostly have 12 drives in RAID 10.
> We are going to redo one machine to compare RAID 10 vs RAID 50.
> Mostly to see if the perfomance is close, the space gain may be
> usefull.
Most likely you have a scsi onboard as well I am guessing. You
shouldn't bother with the 2120. My tests show it is a horrible
controller for random writes.
Comparing software raid on an LSI onboard for an IBM 345 versus a 2120s
using hardware raid 10, the software raid completely blew the adaptec
away.
Joshua D. Drake
--
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To: pgsql-performance@postgresql.org
Cc: jd@commandprompt.com, lists@stringsutils.com
Subject: Re: RAID controllers for Postgresql on large setups
In-Reply-To: <20080512191118.1b40324b@jd-laptop>
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