Re: [Xen-users] Possible bug with scsi disk and Xen

[Jordan Pittier <jordan.pittier@xxxxxxxxx>]

Thanks for your reply. LSI has indeed newer driver for the controler;
but I can't "build" it, there's an error when I try to compile it [see
attachement]. I will give another try in the next days.

What is puzzling is that the IO errors only occurs with Xen HV. I am
100% willing to accept that the problem is the drivers, but how come
the exact same kernel (the xenified one) could work fine without Xen
loaded ? I am almost a noob in kernel/driver and stuff; but I thought
the drivers were entirely in the kernel.

I will try with the latest kernel in a few days.

SLES11SP1 ships mptfusion 4.22
(http://www.novell.com/linux/releasenotes/x86_64/SUSE-SLES/11-SP1/#driver-updates-storage)
I dont know for RHEL

On Sat, Jan 29, 2011 at 6:02 PM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
> On Sat, Jan 29, 2011 at 04:27:25PM +0100, Jordan Pittier wrote:
>>    Hi,
>>    I have been tracking a bug affecting all my servers running Debian Squeeze
>>    for more than a month now, and I*desperately*need your help :)*
>>    I have 10 Sun v20z servers (2*66GB SCSI disk in RAID 1 == mirror). 4 of
>>    them are running Debian Squeeze with the latest Xen Debian kernel
>>    (2.6.32-5-xen-amd64 ==*2.6.32-29). The rest are running Debian Lenny
>>    (2.6.26-2-xen-amd64 ==*2.6.26-26lenny1).
>>    On a Squeeze boxe, under very high IO (such as running a IO stress test,
>>    ie bonnie++), server starts behaving*weirdly and I see messages like these
>>    in kernel.log : [see attachement]. Then the server becomes totally
>>    unresponsive (but doesn't "freeze") and commands such as "ls" or "reboot"
>>    don't work anymore. I have to do an hard reboot. After the server has
>>    reboot, the RAID array seems degraded (I am using the mpt-status command)
>>    and starts rebuilding. After several hours, the raid array is "fine"
>>    ("clean"). The raid controler is "LSI53C1030" U320, with driver "Fusion
>>    MPT SPI Host driver 3.04.06". I have attached the result of "lsmod".
>>    None of my Lenny boxes are affected by this issue, all of my Squeeze boxes
>>    are.
>>    What does it have to do with Xen ? When I boot my Squeeze boxes without
>>    the Xen hypervisor but the same Xen kernel, bonnie++ runs*absolutely*fine.
>>    The issue appears only with the Xen hypervisor loaded.*
>>    There is a debian bug report for this
>>    :*[1]http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=603727
>>    Any suggestion ?*
>
> Did you check if LSI has newer driver version available?
>
> Also you might check which driver version for example RHEL6
> or SLES11SP1 ships with.. both of those distros have 2.6.32 kernels too.
>
> On one of my testboxes I need to upgrade the LSI driver
> to a newer version to make it work. This is SAS based LSI though.
>
> Can you try using another disk controller?
>
> Also: Did you try using the latest kernel (-30) ?
>
> -- Pasi
>
>

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