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Date: Fri, 05 Dec 2008 16:48:23 -0600
From: "Kevin Grittner" <Kevin.Grittner@wicourts.gov>
To: <pgsql-performance@postgresql.org>, "Mario Weilguni" <mweilguni@sime.com>
Subject: Re: Experience with HP Smart Array P400 and SATA
	drives?
References: <4934FE60.30702@sime.com>
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>>> Mario Weilguni <mweilguni@sime.com> wrote: 
> Has anyone benchmarked this controller (PCIe/4x, 512 MB BBC)? We try
to 
> use it with 8x SATA 1TB drives in RAID-5 mode under Linux, and
measure 
> strange values. An individual drive is capable of delivering 91
MB/sec 
> sequential read performance, and we get values ~102MB/sec out of a 
> 8-drive RAID5, seems to be ridiculous slow. Write performance seems
to 
> be much better, ~300 MB /sec - seems ok to me.
 
What's your stripe size?
 
-Kevin