3 messages in com.xensource.lists.xen-develRe: [Xen-devel] xm dmesg
FromSent OnAttachments
Koripella Srinivas28 Jun 2007 20:32 
Cui, Dexuan28 Jun 2007 21:14 
Mark Williamson29 Jun 2007 03:59 
Subject:Re: [Xen-devel] xm dmesg
From:Mark Williamson (mark@cl.cam.ac.uk)
Date:06/29/2007 03:59:12 AM
List:com.xensource.lists.xen-devel

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

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From: xen-@lists.xensource.com [mailto:xen-@lists.xensource.com] On Behalf Of Koripella Srinivas Sent: 2007年6月29日 11:33 To: xen-@lists.xensource.com 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

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