Date: Fri, 17 Mar 2006 11:36:53 -0600
From: "Jim C. Nasby" <jnasby@pervasive.com>
To: Luke Lonergan <llonergan@greenplum.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: 1 TB of memory
Message-ID: <20060317173653.GC15742@pervasive.com>
References: <8B16F5C8-DFC8-4694-902C-AE584E490530@pervasive.com>
	<C03F9AC9.1F5EE%llonergan@greenplum.com>
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On Thu, Mar 16, 2006 at 10:44:25PM -0800, Luke Lonergan wrote:
> Jim,
> 
> > PostgreSQL tuned to the max and still too slow? Database too big to
> > fit into memory? Here's the solution! http://www.superssd.com/
> > products/tera-ramsan/
> 
> With a single 3 Gbyte/second infiniband connection to the device?
> 
> You'd be better off with 4 x $10K servers that do 800MB/s from disk each and
> a Bizgres MPP - then you'd do 3.2GB/s (faster than the SSD) at a price 1/10
> of the SSD, and you'd have 24TB of RAID5 disk under you.
> 
> Plus - need more speed?  Add 12 more servers, and you'd run at 12.8GB/s and
> have 96TB of disk to work with, and you'd *still* spend less on HW and SW
> than the SSD.

Now what happens as soon as you start doing random I/O? :)
-- 
Jim C. Nasby, Sr. Engineering Consultant      jnasby@pervasive.com
Pervasive Software      http://pervasive.com    work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf       cell: 512-569-9461