From mboxrd@z Thu Jan  1 00:00:00 1970
From: Milan Broz <mbroz@redhat.com>
Subject: Re: BUG: Files corrupt after moving LVM volume to USB
	disk
Date: Thu, 22 Mar 2007 11:03:58 +0100
Message-ID: <4602548E.20004@redhat.com>
References: <2a12af650703200334u2b94bbcbt2aab8e94b6f2a527@mail.gmail.com>
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Cc: fsdevel <linux-fsdevel@vger.kernel.org>,
	Andrew Morton <akpm@osdl.org>,
	device-mapper development <dm-devel@redhat.com>,
	linux-kernel@vger.kernel.org, Alasdair G Kergon <agk@redhat.com>
To: Marti Raudsepp <marti@juffo.org>
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Marti Raudsepp wrote:
> This is a reproducible demonstration of the problem initially reported in my
> first e-mail, titled "PROBLEM: 'bio too big device' after moving to a USB
> disk" (http://lkml.org/lkml/2007/3/7/657)
...
> 06. Observe "bio too big device dm-0 (256 > 240)" messages in dmesg
> 
> [non]# dmesg |tail -n7
> [101403.106825] bio too big device dm-0 (256 > 240)
> [101403.115228] bio too big device dm-0 (256 > 240)
> [101403.115912] bio too big device dm-0 (256 > 240)
> [101403.130529] bio too big device dm-0 (256 > 240)
> [101403.131220] bio too big device dm-0 (256 > 240)
> [101403.141577] bio too big device dm-0 (256 > 240)
> [101403.142255] bio too big device dm-0 (256 > 240)

if (unlikely(bio_sectors(bio) > q->max_hw_sectors)) {
	printk("bio too big device %s (%u > %u)\n", 
...

Please could you try if this patch helps ?
http://www.kernel.org/pub/linux/kernel/people/agk/patches/2.6/editing/dm-merge-max_hw_sector.patch


Milan
--
mbroz@redhat.com