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Re: [Xen-devel] Re: Weird Issue with raid 5+0

To: chris <tknchris@xxxxxxxxx>
Subject: Re: [Xen-devel] Re: Weird Issue with raid 5+0
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Mon, 08 Mar 2010 15:26:42 -0800
Cc: linux-raid@xxxxxxxxxxxxxxx, Neil Brown <neilb@xxxxxxx>, Xen-Devel List <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On 03/08/2010 07:35 AM, chris wrote:
I forwarding this to xen-devel because it appears to be a bug in dom0 kernel.

I recently experienced a strange issue with software raid1+0 under Xen
on a new machine. I was getting corruption in my guest volumes and
tons of kernel messages such as:

[305044.571962] raid0_make_request bug: can't convert block across
chunks or bigger than 64k 14147455 4

The full thread is located at http://marc.info/?t=126672694700001&r=1&w=2
Detailed output at http://pastebin.com/f6a52db74

It appears after speaking with the linux-raid mailing list that this
is due a bug which has been fixed but the fix is not included in the
dom0 kernel. I'm not sure what sources kernel 2.6.26-2-xen-amd64 is
based on, but since xenlinux is still at 2.6.18 I was assuming that
this bug would still exist.

There are a number of possible dom0 kernel in use. The xen.org 2.6.18-xen tree is still maintained on a bugfix basis. Are you seeing the problem with 2.6.18-xen?

I don't know what 2.6.26-2-xen-amd64 is, but I'm guessing from the name it is a Debian kernel. I don't know what its provenance is, but it is not a xen.org supported kernel; if a fix is needed you should file a bug against your distro.

Modern Xen kernels are based on 2.6.31.x and 2.6.32.x. See http://wiki.xensource.com/xenwiki/XenParavirtOps and http://wiki.xensource.com/xenwiki/XenDom0Kernels for more details.


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