[Xen-users] RE: xen dom0 crashes while copying a lot of files - usb support to blame

["John Shen" <John.Shen@xxxxxxxx>]

To answer my own question, I finally figured it out that the usb was the 
culprit. Passing nousb to the domU kernel solves the problem beautifully. I 
accidentally bumped into the solution when I installed Fedora Core as a VMWare 
guest, and xenified the FC guest without usb. The xen guest vms within the FC 
vmware vm does not crash with heavy I/O.
 
I confirmed that usb was the problem by finding this document by dell 
engineers. Had I found it earlier, I would not have wasted so much time on this 
and other things that dell engineers already figured out. Oh, well, this sort 
of things happens.
 
http://www.dell.com/downloads/global/power/ps2q06-20050322-Schmidt-OE.pdf#search=%22xen%20dell%20poweredge%202850%22
 
It works for me and hope it will also work for you. It might be useful for 
others as well so I am copying the mailing list as well.
 
 
System Coordinator, Online Information System
Student Affairs, University of California, Office of the President

________________________________

From: John Shen
Sent: Wed 8/23/2006 4:44 AM
To: rickey berkeley; Bruno Rodrigues Silva
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: xen dom0 crashes while copying a lot of files


i have been using the binary installation from xen source (3.0.2). although i 
did not do a thorough testing, if i shut down xend and xendomains services, and 
then does the copy, the kernel itself did not crash. then i can turn on these 
services again. probably this could be a workaround but i am not sure.
 
John Shen 510-326-8473 Fax: 510-987-9612
System Coordinator, Online Information System
Student Affairs, University of California, Office of the President

________________________________

From: rickey berkeley [mailto:rickey.berkeley@xxxxxxxxx]
Sent: Tue 8/22/2006 2:31 AM
To: Bruno Rodrigues Silva
Cc: John Shen; xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: xen dom0 crashes while copying a lot of files



for this , I suggest u to install the bianary version of xen ,
not to compile and install  by yourselfit.That would be more stable.

On 8/21/06, Bruno Rodrigues Silva <brunors@xxxxxx> wrote:
> Me too.
> I have this problem and i do not know how to do.
>
> Bruno
>
> On Sun, 2006-08-20 at 06:04 -0700, John Shen wrote:
> > xen 3.0.2 dom0 (kernel 2.6.16-xen) always crashes, or rather freezes,
> whenever I copy more than 40GB of data.
> >
> > i checked syslog and there is no indication at all why it crashes. this
> happens whether the OS is FC5 or mandriva 2006, and is also independent of
> hardware, although we have mostly
> > dell poweredge (1750, 2850, etc.)
> >
> > i am wondering if there some workaround. thanks!
> > System Coordinator, Online Information System
> > Student Affairs, University of California, Office of the President
> >
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