WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

Re: [Xen-devel] xm dmesg

If you can't get a serial cable onto the host, you could add "noreboot" to the 
Xen commandline, then you'll be able to read the messages off the screen (and 
maybe take a picture with a digital camera!).  Of course, if the messages are 
long enough to scroll off the screen then this won't necessarily help :-(

Another trick that can be useful is to run Xen within and HVM domain.  Whilst 
this isn't exactly a highly used / tested configuration, it generally works 
for me.  The HVM domain has a virtual serial port, which you can use to 
capture all the data without actually having to have a real serial line on 
the box.  It's also easier to remote reboot an HVM domain if it crashes than 
to reboot a crashed physical machine remotely.

Cheers,
Mark

On Friday 29 June 2007, Cui, Dexuan wrote:
> My suggestion is that you may need a serial cable ----- using it, you can
> record all the messages Xen prints, even when Xen hung/crashed.
>
>
>
> -- Dexuan
>
>
>
> ________________________________
>
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Koripella
> Srinivas Sent: 2007年6月29日 11:33
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] xm dmesg
>
>
>
> Hi,
>
> I have done some changes to xen code for shadow page tables.
> After i bring up a guest to test these changes because of some error  the
> system reboots and i cant find out the reasonn for the error because i lose
> the contents of 'xm dmesg' .(because the system reboot has overwritten the
> old contents.) Is there anyway i can see the old contents of xm dmesg or
> some way to back it bedore it has rebooted
>
>
> Thanks
>
>
>
>
>
> ________________________________
>
> Download prohibited? No problem. CHAT
> <http://in.rd.yahoo.com/tagline_webmessenger_1/*http:/in.messenger.yahoo.co
>m/webmessengerpromo.php>  from any browser, without download.



-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>