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From: Michael Stone <mstone+postgres@mathom.us>
To: pgsql-performance@postgresql.org
Subject: Re: What's the best hardver for PostgreSQL 8.1?
Date: Tue, 27 Dec 2005 14:05:16 -0500
Message-ID: <20051227190516.GB6811@mathom.us> (raw)
In-Reply-To: <6.2.5.6.0.20051227110304.01dc1000@earthlink.net>
References: <200512212209.50234.caseroj@comcast.net>
	<200512212231.55100.caseroj@comcast.net>
	<20051224135042.484c6e32.frank@wiles.org>
	<6.2.5.6.0.20051224161551.01dc5d98@earthlink.net>
	<Pine.LNX.4.62.0512241350010.2807@qnivq.ynat.uz>
	<6.2.5.6.0.20051224172653.01dd4c08@earthlink.net>
	<20051225173755.GA6986@mathom.us>
	<33c6269f0512260932g38c9b7a4uc2aba00f72ff77@mail.gmail.com>
	<20051227133526.GA6811@mathom.us>
	<6.2.5.6.0.20051227110304.01dc1000@earthlink.net>

On Tue, Dec 27, 2005 at 11:50:16AM -0500, Ron wrote:
>Sorry.  A decade+ RWE in production with RAID 5 using controllers as 
>bad as Adaptec and as good as Mylex, Chaparral, LSI Logic (including 
>their Engino stuff), and Xyratex under 5 different OS's (Sun, Linux, 
>M$, DEC, HP) on each of Oracle, SQL Server, DB2, mySQL, and pg shows 
>that RAID 5 writes are slower than RAID 5 reads

What does that have to do with anything? That wasn't the question...

>RAID 5 is not a silver bullet.

Who said it was? Nothing is, not even RAID 10. The appropriate thing to
do is to make decisions based on requirements, not to make sweeping
statements that eliminate entire categories of solutions based on hand
waving.

Mike Stone

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