Xen users - May 2009 - should restarting xend restart all the domU''s?

I had an issue late yesterday where some windows domU''s were down. The
person who "owns" those domUs let windows updates install and then
restart, which they failed to restart. When I tried to manually restart
them I was getting can''t allocate memory errors. 

In the past I''ve had can''t allocate memory errors when trying
to bring
up a new domU. Restarting virt-manager usually clears that. This time it
did not help. 

So I restarted xend. Only problem is it restarting all the domUs that
were running ok. 

1) Is that the expected behavior? (restarting xend restarts all domUs)

2) Is there anything else I should have checked or done for the memory
error besides restarting xend?

System is sles10sp2, ocfs2 storage, xen-3.2.0_16718_18-0.3.

Thanks,
James


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On Thu, May 14, 2009 at 6:59 PM, James Pifer <jep@obrien-pifer.com>
wrote:
> So I restarted xend. Only problem is it restarting all the domUs that
> were running ok.
>
> 1) Is that the expected behavior? (restarting xend restarts all domUs)
Not on RHEL5 or opensolaris, restarting xend on those platforms
doesn''t restart running domUs. Not sure about sles though.

You probably have something like this on your domU (ubuntu-pv is my domU name)

# xm list -l ubuntu-pv | grep xend
    (on_xend_start start)
    (on_xend_stop shutdown)

Try changing it to (on_xend_stop ignore)
>
> 2) Is there anything else I should have checked or done for the memory
> error besides restarting xend?
What was the error?
Usually temporarily ballooning down dom0 (or other running domUs)
manually is enough.

Regards,

Fajar

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On Thu, 2009-05-14 at 19:40 +0700, Fajar A. Nugraha
wrote:
> On Thu, May 14, 2009 at 6:59 PM, James Pifer <jep@obrien-pifer.com>
wrote:
> > So I restarted xend. Only problem is it restarting all the domUs that
> > were running ok.
> >
> > 1) Is that the expected behavior? (restarting xend restarts all domUs)
> 
> Not on RHEL5 or opensolaris, restarting xend on those platforms
> doesn''t restart running domUs. Not sure about sles though.
> 
> You probably have something like this on your domU (ubuntu-pv is my domU
name)
> 
> # xm list -l ubuntu-pv | grep xend
>     (on_xend_start start)
>     (on_xend_stop shutdown)
This does appear to be the case. If I change these settings then restart
the server (which doesn''t happen very often of course) the
domU''s would
need to be shut down manually before shutdown/restart of dom0?

Thanks,
James


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