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

[Jordan Pittier <jordan.pittier@xxxxxxxxx>]

>Xen dom0 kernel does irq handling through Xen hypervisor,

>so that might make some drivers behave in a different way baremetal vs. dom0.

Ok, so the driver is a good "responsible" for this SCSI crazyness.

>What driver version does the squeeze kernel have?
3.04. Which seems to be several years old. There is lot of users complaining about LSI drivers all over the Internet.�

I will keep you posted as soon as I manage to build the latest driver.

On Sat, Jan 29, 2011 at 7:25 PM, Pasi K�k�en <pasik@xxxxxx> wrote:
> On Sat, Jan 29, 2011 at 07:03:16PM +0100, Jordan Pittier wrote:
>> 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.
>>
>
> Yep, the driver is entirely in the kernel, but that's not the whole story.
>
> Xen dom0 kernel does irq handling through Xen hypervisor,
> so that might make some drivers behave in a different way baremetal vs. dom0.
>
> Also remember dom0 is a *vm*, so some timing stuff might happen
> differently on baremetal vs. dom0.
>
>> 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
>>
>
> What driver version does the squeeze kernel have?
>
>
> -- Pasi
>
>
>> On Sat, Jan 29, 2011 at 6:02 PM, Pasi K�k�en <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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