linux-kernel - Re: data corruption with stex (Promise HW-Raid) driver and device-mapper

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Date:	Thu, 25 Nov 2010 10:57:04 +0100
From:	Milan Broz <mbroz@...hat.com>
To:	Ed Lin - PTU <ed.lin@...mise.com>
CC:	Dan Carpenter <error27@...il.com>,
	Markus Schulz <msc@...zsystem.de>,
	linux-kernel@...r.kernel.org,
	device-mapper development <dm-devel@...hat.com>
Subject: Re: data corruption with stex (Promise HW-Raid) driver and device-mapper

On 11/16/2010 02:35 AM, Ed Lin - PTU wrote:
> The stex driver sets sg_tablesize as 32 (for st_yel it's 38) in the probe
> entry. It seems that this value was overridden by the system if using
> dm/lvm, for unknown reason. The driver received requests with more
> sg items than registered. Sg item number could be as high as 64. This
> is completely unexpected. The firmware could not handle such
> requests, and error occurred.

Device-mapper respects hw restrictions, so it must be bug somewhere.

Please cc dm-devel if you think that problem is there.

Milan
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