Re: [Xen-users] VM getting hang

[gopikrishnan <gopikrishnan@xxxxxxxxxxxx>]

Hi,

 Thanks for getting back to me.

 We are using CentOS release 5.2 (DOM 0) and Xen version 3.1.2-92.1.18.el5. 
All the VPS (DOM U) are various distros of LINUX. 

And we are using an LVM setup in this DOM 0. 

xm top
=========
xentop - 21:53:55   Xen 3.1.2-92.1.18.el5
36 domains: 1 running, 35 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 8386596k total, 6288484k used, 2098112k free    CPUs: 4 @ 2660MHz
============

And unfortunately, we need to reboot the DOM 0 today and at that time, we got 
the following error message:
===========
sd 0:0:0:0: rejecting I/O to offline device
sd 0:0:0:0: rejecting I/O to offline device
============

Hope this can give some hint.

On Friday 23 January 2009 15:37, Fajar A. Nugraha wrote:
> On Fri, Jan 23, 2009 at 4:46 PM, gopikrishnan <gopikrishnan@xxxxxxxxxxxx> 
wrote:
> > We have a few XEN virtual machines in our main node.  The issue goes
> > like, at some particular time, some VPS wont come after reboot and it
> > will get hanged during the booting process. Suppose, if we try to reboot
> > a perfectly working vps in the same node during that time, then that also
> > will get down.
>
> Let me guess. You're using external storage? Probably a non-enterprise one?
> If yes, then most likely it's your storage (disks, controller, SAN
> switches) that's acting up.
>
> If not, then you better give more info about your setup. Saying "help,
> my machine hangs" without any more info won't get you anywhere. Start
> with :
> - what OS/xen combo that you use
> - what your hardware setup is like
> - what do log files say (/var/log/messages, etc.)
> - what do iostat, top, and xmtop shows
>
> Regards,
>
> Fajar
>
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