From: Jim C. Nasby <jnasby@pervasive.com>
To: Bruce Momjian <pgman@candle.pha.pa.us>
Cc: Joshua D. Drake <jd@commandprompt.com>
Cc: Vivek Khera <vivek@khera.org>
Cc: Pgsql-Performance ((E-mail)) <pgsql-performance@postgresql.org>
Cc: PostgreSQL General <pgsql-general@postgresql.org>
Subject: Re: [PERFORM] Arguments Pro/Contra Software Raid
Date: Thu, 11 May 2006 17:19:28 -0500
Message-ID: <20060511221928.GV99570@pervasive.com> (raw)
In-Reply-To: <200605100059.k4A0xtK09977@candle.pha.pa.us>
References: <4460DE97.9040001@commandprompt.com>
<200605100059.k4A0xtK09977@candle.pha.pa.us>
On Tue, May 09, 2006 at 08:59:55PM -0400, Bruce Momjian wrote:
> Joshua D. Drake wrote:
> > Vivek Khera wrote:
> > >
> > > On May 9, 2006, at 11:51 AM, Joshua D. Drake wrote:
> > >
> > >> Sorry that is an extremely misleading statement. SATA RAID is
> > >> perfectly acceptable if you have a hardware raid controller with a
> > >> battery backup controller.
> > >>
> > >> And dollar for dollar, SCSI will NOT be faster nor have the hard drive
> > >> capacity that you will get with SATA.
> > >
> > > Does this hold true still under heavy concurrent-write loads? I'm
> > > preparing yet another big DB server and if SATA is a better option, I'm
> > > all (elephant) ears.
> >
> > I didn't say better :). If you can afford, SCSI is the way to go.
> > However SATA with a good controller (I am fond of the LSI 150 series)
> > can provide some great performance.
>
> Basically, you can get away with cheaper hardware, but it usually
> doesn't have the reliability/performance of more expensive options.
>
> You want an in-depth comparison of how a server disk drive is internally
> better than a desktop drive:
>
> http://www.seagate.com/content/docs/pdf/whitepaper/D2c_More_than_Interface_ATA_vs_SCSI_042003.pdf
BTW, someone (Western Digital?) is now offering SATA drives that carry
the same MTBF/warranty/what-not as their SCSI drives. I can't remember
if they actually claim that it's the same mechanisms just with a
different controller on the drive...
--
Jim C. Nasby, Sr. Engineering Consultant jnasby@pervasive.com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
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To: pgsql-performance@postgresql.org
Cc: jnasby@pervasive.com, pgman@candle.pha.pa.us, jd@commandprompt.com, vivek@khera.org, pgsql-general@postgresql.org
Subject: Re: [PERFORM] Arguments Pro/Contra Software Raid
In-Reply-To: <20060511221928.GV99570@pervasive.com>
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