Re: Re: [Xen-devel] pci-passthrough in pvops causing offline raid

From: Mark Adams <mark@campbell-lange.net>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
	"xen-users@lists.xensource.com" <xen-users@lists.xensource.com>,
	"JBeulich@novell.com" <JBeulich@novell.com>
Subject: Re: Re: [Xen-devel] pci-passthrough in pvops causing offline raid
Date: Tue, 16 Nov 2010 10:37:22 +0000	[thread overview]
Message-ID: <20101116103722.GA10771@campbell-lange.net> (raw)
In-Reply-To: <20101115174413.GA8227@dumpdata.com>

On Mon, Nov 15, 2010 at 12:44:13PM -0500, Konrad Rzeszutek Wilk wrote:
> On Mon, Nov 15, 2010 at 05:23:09PM +0000, Mark Adams wrote:
> > On Mon, Nov 15, 2010 at 12:15:44PM -0500, Konrad Rzeszutek Wilk wrote:
> > > On Sun, Nov 14, 2010 at 05:15:02PM +0000, Mark Adams wrote:
> > > > 
> > > > On 12 Nov 2010, at 22:22, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> wrote:
> > > > 
> > > > > On Fri, Nov 12, 2010 at 05:10:58PM +0000, Mark Adams wrote:
> > > > >> On Thu, Nov 11, 2010 at 02:06:58PM -0500, Konrad Rzeszutek Wilk wrote:
> > > > >>>> I've just noticed this at the end of xm dmesg
> > > > >>>> 
> > > > >>>> (XEN) msi.c:715: MSI is already in use on device 02:00.0
> > > > >>>> (XEN) msi.c:715: MSI is already in use on device 02:00.0
> > > > >>>> (XEN) msi.c:715: MSI is already in use on device 02:00.0
> > > 
> > > Looking briefly at the code it means that somebody enabled the MSI
> > > already on the device and did not disable them. But I wonder how
> > > you got those in the first place. Did you use xen-pciback.hide (for PVOPS kernels)
> > > or pciback.hide (for older kernels) to "hide" the devices away from the
> > > Linux Dom0 kernel?
> > 
> > using xen-pciback.hide as its a pvops kernel (debian squeeze
> > 2.6.32-5-27)
> 
> Ok. Then it might be worth looking in when this happens. I think
> there is an argument on the Xen hyperisor line to include the time-stamp, but
> I don't remember it :-(
> 
> > > Didn't you say that you had two servers and saw this problem on another
> > > box too?
> > > 
> > > Without more details on the Xen hypervisor line or the kernel line when
> > > the failure occurs I sadly can't help you.
> > 
> > Yes this occurs on both servers that I've tried it on. Doesn't the MSI
> > log above indicate that there is a conflict - which is what ends up
> > causing the device to go offline? Is there no other way to identify the
> 
> Could be, but it is unclear - it depends on when the message pops out.
> 
> But that does not help with finding out why your RAID controller goes offline.

Stephan Austermuhle advises that nothing is logged via remote syslog
when this hang occurs. I'll reply on that thread to see if he can add
the additional logging

> 
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