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Re: performance drop on RAID5

From: Rosser Schwarz <rosser(dot)schwarz(at)gmail(dot)com>
To: Alexandre Barros <alexandre(at)vectorx(dot)com(dot)br>
Cc: postgres performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: performance drop on RAID5
Date: 2005-08-24 16:35:01
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Lists: pgsql-performance
On 8/24/05, Alexandre Barros <alexandre(at)vectorx(dot)com(dot)br> wrote:

> i wouldn't be so stunned if the newer machine was ( say ) twice faster
> than the older server, but over three times faster is disturbing.

RAID5 on so few spindles is a known losing case for PostgreSQL.  You'd
be far, far better off doing a pair of RAID1 sets or a single RAID10



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