From: Greg Smith <greg@2ndquadrant.com>
To: Yeb Havinga <yebhavinga@gmail.com>
Cc: Francisco Reyes <lists@stringsutils.com>
Cc: Pgsql performance <pgsql-performance@postgresql.org>
Subject: Re: 10K vs 15k rpm for analytics
Date: Tue, 02 Mar 2010 16:03:20 -0500
Message-ID: <4B8D7D18.9030407@2ndquadrant.com> (raw)
In-Reply-To: <4B8D7A6C.3010304@gmail.com>
References: <cone.1267562557.293175.32557.1000@shelca>
<4B8D7A6C.3010304@gmail.com>
Yeb Havinga wrote:
> With 24 drives it'll probably be the controller that is the limiting
> factor of bandwidth. Our HP SAN controller with 28 15K drives delivers
> 170MB/s at maximum with raid 0 and about 155MB/s with raid 1+0.
You should be able to clear 1GB/s on sequential reads with 28 15K drives
in a RAID10, given proper read-ahead adjustment. I get over 200MB/s out
of the 3-disk RAID0 on my home server without even trying hard. Can you
share what HP SAN controller you're using?
--
Greg Smith 2ndQuadrant US Baltimore, MD
PostgreSQL Training, Services and Support
greg@2ndQuadrant.com www.2ndQuadrant.us
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Subject: Re: 10K vs 15k rpm for analytics
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