[prev in list] [next in list] [prev in thread] [next in thread] 

List:       linux-ha-dev
Subject:    Re: [Linux-ha-dev] Xen resource patch add locking to startup
From:       Sebastian Reitenbach <sebastia () l00-bugdead-prods ! de>
Date:       2009-03-11 12:32:24
Message-ID: 200903111332.24852.sebastia () l00-bugdead-prods ! de
[Download RAW message or body]

On Monday 09 March 2009 03:28:11 pm Lars Marowsky-Bree wrote:
> On 2009-03-05T16:02:02, Sebastian Reitenbach <sebastia@l00-bugdead-prods.de> 
wrote:
> > Hi,
> >
> > I experienced some problems with Xen resources.
> >
> > I have a 4 node cluster, running 14 Xen domU's.
>
> Sounds good.
>
> > To not have a race condition on startup, when e.g. one node comes back
> > from standby, or one node dies, I had to add order constraints for each
> > domU,
> >
> > e.g. domU1 before domU2
> >       domU1 before domU3
> >       domU1 before domU4
>
> Which race condition is this supposed to avoid ...? One internal to Xen,
> or in your DomU work-load?
When using automatic memory management, and then starting some domU's in 
parallel on the same node, due to the fact how they check for available 
memory, and that one Xen RA is not really aware of otheres, and what they are 
doing, it can happen that they overcommit memory.


>
> > However, in the larger cluster, there the cluster is busy with itself,
> > managing resources. E.g. the GUI seems to hang often, because of a too
> > busy crmd. The cluster is busy with propagating updates of the cib,
> > commands will time out....
>
> That should NOT happen. Please file a bug.
will do so.

Sebastian
>
>
> Regards,
>     Lars
_______________________________________________________
Linux-HA-Dev: Linux-HA-Dev@lists.linux-ha.org
http://lists.linux-ha.org/mailman/listinfo/linux-ha-dev
Home Page: http://linux-ha.org/
[prev in list] [next in list] [prev in thread] [next in thread]