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Date:      Wed, 17 Aug 2005 16:57:03 +1200
From:      Mark Kirkwood <markir@paradise.net.nz>
To:        Mark Kane <mark@mkproductions.org>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: ad10: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=11441599
Message-ID:  <4302C39F.2090500@paradise.net.nz>
In-Reply-To: <43021000.2090701@mkproductions.org>
References:  <43021000.2090701@mkproductions.org>

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Mark Kane wrote:
>
> However, note that if I turn the drives speed down to UDMA100, the 
> errors seem to go away. Has anyone else tried this for their problems?
> 

I currently do this, not due to problems, but to improve the write 
performance:

4xMaxtor 6E040L0  RAID0

UDMA133 -> 40M/s
UDMA100 -> 120M/s

(seem to find read performance is *slightly* slower for UDMA100, but not 
enough to make it worth worrying about).

However this may just be a quirk specific to my system (Tyan S2510 + 
PCD20271).

Cheers

Mark



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