From: Bruce Momjian <pgman@candle.pha.pa.us>
To: Vivek Khera <vivek@khera.org>
Cc: Pgsql-Performance ((E-mail)) <pgsql-performance@postgresql.org>
Subject: Re: [GENERAL] Arguments Pro/Contra Software Raid
Date: Wed, 10 May 2006 10:35:59 -0400 (EDT)
Message-ID: <200605101435.k4AEZxc13602@candle.pha.pa.us> (raw)
In-Reply-To: <29EA6D53-F41E-4A09-B5CA-EFD182AB9772@khera.org>
Vivek Khera wrote:
>
> On May 10, 2006, at 12:41 AM, Greg Stark wrote:
>
> > Well, dollar for dollar you would get the best performance from
> > slower drives
> > anyways since it would give you more spindles. 15kRPM drives are
> > *expensive*.
>
> Personally, I don't care that much for "dollar for dollar" I just
> need performance. If it is within a factor of 2 or 3 in price then
> I'll go for absolute performance over "bang for the buck".
That is really the issue. You can buy lots of consumer-grade stuff and
work just fine if your performance/reliability tolerance is high enough.
However, don't fool yourself that consumer and server-grade hardware is
internally the same, or has the same testing.
I just had a Toshiba laptop drive replaced last week (new, not
refurbished), only to have it fail this week. Obviously there isn't
sufficient burn-in done by Toshiba, and I don't fault them because it is
a consumer laptop --- it fails, they replace it. For servers, the
downtime usually can't be tolerated, while consumers usually can
tolerate significant downtime.
I have always purchased server-grade hardware for my home server, and I
think I have had one day of hardware downtime in the past ten years.
Consumer hardware just couldn't do that.
As one data point, most consumer-grade IDE drives are designed to be run
only 8 hours a day. The engineering doesn't anticipate 24-hour
operation, and that trade-off passes all the way through the selection
of componients for the drive, which generates sigificant cost savings.
--
Bruce Momjian http://candle.pha.pa.us
EnterpriseDB http://www.enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
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To: pgsql-performance@postgresql.org
Cc: pgman@candle.pha.pa.us, vivek@khera.org
Subject: Re: [GENERAL] Arguments Pro/Contra Software Raid
In-Reply-To: <200605101435.k4AEZxc13602@candle.pha.pa.us>
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