From: Andreas Kostyrka <andreas@kostyrka.org>
To: Joshua D. Drake <jd@commandprompt.com>
Cc: jason@ohloh.net <jason@ohloh.net>
Cc: Geoff Tolley <geoff@polimetrix.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: SCSI vs SATA
Date: Wed, 4 Apr 2007 17:43:05 +0200
Message-ID: <20070404154305.GA25764@andi-lap.la.revver.com> (raw)
In-Reply-To: <4613C14A.4020703@commandprompt.com>
References: <9C0858F5-0A48-4AF9-80FF-E4BA14F0F965@ohloh.net>
<E1HYs6Y-0008O5-SN@elasmtp-banded.atl.sa.earthlink.net>
<E1HYsBX-0006ZE-JG@elasmtp-banded.atl.sa.earthlink.net>
<4613053F.5070401@polimetrix.com>
<DF6C723E-7362-4173-8309-B8AAFC968E2C@ohloh.net>
<4613C14A.4020703@commandprompt.com>
* Joshua D. Drake <jd@commandprompt.com> [070404 17:40]:
>
> >Good point. On another note, I am wondering why nobody's brought up the command-queuing perf benefits (yet). Is this because sata vs scsi are at
>
> SATAII has similar features.
>
> >par here? I'm finding conflicting information on this -- some calling sata's ncq mostly crap, others stating the real-world results are negligible. I'm inclined to believe SCSI's
> >pretty far ahead here but am having trouble finding recent articles on this.
>
> What I find is, a bunch of geeks sit in a room and squabble about a few percentages one way or the other. One side feels very l33t because their white paper looks like the latest
> swimsuit edition.
>
> Real world specs and real world performance shows that SATAII performs, very, very well. It is kind of like X86. No chip engineer that I know has ever said, X86 is elegant but guess
> which chip design is conquering all others in the general and enterprise marketplace?
Actually, to second that, we did have very similiar servers with
SCSI/SATA drives, and I did not notice any relevant measurable
difference. OTOH, the SCSI discs were way less reliable than the SATA
discs, that might have been bad luck.
Andreas
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To: pgsql-performance@postgresql.org
Cc: andreas@kostyrka.org, jd@commandprompt.com, jason@ohloh.net, geoff@polimetrix.com
Subject: Re: SCSI vs SATA
In-Reply-To: <20070404154305.GA25764@andi-lap.la.revver.com>
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