Xen users - Nov 2007 - Re: Error: The privileged domain did not balloon! afterreboot of Dom0, it just works

Hi,

Dominik Klein <dk@in-telegence.net> wrote: 
> Sebastian Reitenbach wrote:
> > Hi,
> > 
> > I try to setup a linux ha based cluster, managing virtual Xen domU 
> > resources. When the cluster is up for e.g. a day or two, and then I
want
to 
> > move the Xen domU''s from one host to another, I get the
following errors
in 
> > the logfile:
> > 
> > lrmd[9971]: 2007/11/12_11:20:53 info: RA output: (NFS_SW:start:stderr)
> > Error: The privileged domain did not balloon!
> > 
> > This also happens when I then try to start the domU instance via 
> > xm create
> > When I then reboot the dom0, then xm create works fine again without 
> > problems. So this behaviour is useless, when it comes to a fail-over
in
the 
> > cluster after a week or so. When both cluster nodes started up, the 
> > migration of the resources from one host to another work well. 
> > 
> > Is there a way to prevent this failure, sth. I can do?
> 
> Try limiting dom0s memory so it does not have to balloon. This is done 
> in your boot manager:
> /boot/grub/menu.lst
> ...
> title XEN3.1.0
> root (hd0,0)
> kernel /boot/xen-3.1.0.gz dom0_mem=256M dom0_vcpus_pin
>                            ^^^^^^^^^^^^^
Ah, that sounds a bit like working on fixing the symptoms, instead of 
working on the real cause of the problem. Nevertheless, I''ll add that 
parameter and will see whether it helps.
After adding the parameter, does that mean that the dom0 will stop 
ballooning at all? 

kind regards
Sebastian
> 
> Regards
> Dominik
> 
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> http://lists.xensource.com/xen-users
> 

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> After adding the parameter, does that mean that the dom0 will stop 
> ballooning at all? 
It will not see more memory than what you set in dom0_mem. If it has 
some memory free, it might still balloon below that limit if you start a 
domU that wants that memory.

Regards
Dominik


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