Re: [Xen-users] Xen reboots on dom-U disk stress...

[Roland Paterson-Jones <roland@xxxxxxxxxxxx>]

Yes, spot on, it was running out of page space in dom-0 after which 
Linux seemed to go on a process killing spree before turning the gun on 
itself and rebooting. Not very pretty.
And yes, NFS + loopback looks particularly ugly. I got it to finally run 
with 1G in dom-0!
We're trying GNDB, iSCSI et al... (any preferences?)

Thanks
Roland

Mark Williamson wrote:

> How much memory does dom0 have?  I believe NFS + loopback files is very prone 
> to out-of-memory problems so it seems most likely your dom0 died.
> If you hook up a serial line, you might be able to get some useful output 
> before it dies.
> Had you considered using something like GNBD instead of NFS + loopback?  It 
> should perform better and be less prone to OOM problems.
> Cheers,
> Mark
>
> On Wednesday 11 May 2005 08:36, Roland Paterson-Jones wrote:
>  
>
> > Hi all
> >
> > I tried to run bonnie++ disk stresser in dom-U, who's disk is backed
> > with non-local (on nfs) loop-back file.
> >
> > The machine rebooted pretty quickly.
> >
> > So, how do I tell what's barfing? Is it Xen? Is it dom-0 (nfs or
> > loop-back)?
> >
> > I looked in dom-0's /var/log/messages and didn't see any obvious record
> > of a dom-0 whoopsie (but is that the right place to look etc...).
> >
> > Any help greatfully received.
> >
> > Incidently, I ran bonnie++ successfully in dom-U with disk backed by
> > local (dom-0 ext3) loop-back file. This pleasantly surprised me, as
> > loop-back files don't have a good rep for stability under load.
> >
> > Regards
> > Roland
> >
> >
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