linux-kernel - Re: megaraid_sas waiting for command and then offline

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Message-Id: <1161817415.7615.37.camel@localhost.localdomain>
Date:	Thu, 26 Oct 2006 00:03:35 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Brett G. Durrett" <brett@...u.com>
Cc:	"David N. Welton" <d.welton@...ster.it>,
	linux-kernel@...r.kernel.org
Subject: Re: megaraid_sas waiting for command and then offline

Ar Mer, 2006-10-25 am 15:48 -0700, ysgrifennodd Brett G. Durrett:
> After I reported an additional failure, Sumant said they were able to 
> reproduce the problems with XFS but they have not seen it with EXT3. 

I've seen precisely that pattern with a couple of IDE controllers. In
both cases they had problems with very large I/O requests. XFS was
generating extremely long linear reads and writes while ext3 tended to
generate nice I/O patterns but never really huge ones.

(The IDE drivers in question have since been fixed except for IT821x
where some firmware versions in raid mode still barf)

Alan

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