raid10_make_request bug: can"t convert block across chunks or bigger [...]

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I'm now seeing the exact same problem as Ask did in:

http://www.mail-archive.com/linux-raid@vger.kernel.org/msg06 762.html

again using md raid10 under LVM, trying to export an LV to a xen
domain.

This is on the latest Debian Etch kernel based on 2.6.18.4.

Ask didn't seem to get any on list replies - can anyone shed any light?

Cheers,
Andy

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Re: raid10_make_request bug: can"t convert block across chunks or bigger [...]

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Sorry for the reply to self, but the last thing I tried has provided
some more info:

On Sat, Apr 07, 2007 at 03:10:27AM +0000, Andy Smith wrote:
> I'm now seeing the exact same problem as Ask did in:
>=20
> http://www.mail-archive.com/linux-raid@vger.kernel.org/msg06 762.html
>=20
> again using md raid10 under LVM, trying to export an LV to a xen
> domain.

This LV was initially created as 512M in size. I extended it to 1G
and experienced the same thing. I then created a new LV of size 2G,
copied the contents of the first LV to the second, and used that as
the domain's root filesystem. I no longer get this problem.

I then deleted the original LV and renamed the new LV to the name of
the original and things still work. I am able to do:

dd if=3D/dev/sda1 of=3D/dev/null

in the Xen domain and not receive any errors so I have to conclude
that all blocks of this second LV are readable. So is this an issue
of the layout of the LVM extents on disk? Will I get this problem
again? Should I be pursuing this on the LVM list, here, or maybe
even with the Xen folks?

Cheers,
Andy

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