From mboxrd@z Thu Jan  1 00:00:00 1970
From: Maurice Hilarius <maurice@harddata.com>
Subject: Re: Awful RAID5 random read performance
Date: Mon, 01 Jun 2009 06:43:28 -0600
Message-ID: <4A23CCF0.7030104@harddata.com>
References: <20090601045710141.GMHE24335@cdptpa-omta04.mail.rr.com> <200905312339.12234.tfjellstrom@shaw.ca>
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Thomas Fjellstrom wrote:
> ..
> Yet I've heard NCQ makes some things worse. Some raid tweaking pages tell you 
> to try disabling NCQ.
>   

Not so relevant here.
This recommendation to  disable drive NCQ is generally due tot he fact 
that NCQ implementations by various manufacturers tend
to differ in behaviour, and, in some cases , is just plain "broken".


-- 
Regards, Maurice