Re: performance drop on RAID5

On Wed, 24 Aug 2005 11:43:05 -0300
Alexandre Barros <alexandre@vectorx.com.br> wrote:

> I've googled a little, and maybe the cluster size might be one
> problem,  but despite that, the performance dropping when running on
> "server-class" hardware with RAID-5 SCSI-2 drives was way above my
> most  delirious expectations... i need some help to figure out what is
> **so**  wrong...

  RAID-5 isn't great for databases in general.  What would be better
  would be to mirror the disks to redundancy or do RAID 1+0.

  You could probably also increase your shared_buffers some, but
  that alone most likely won't make up your speed difference.

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   Frank Wiles <frank@wiles.org>
   http://www.wiles.org
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