Re: RE Multiple Dom0s sharing a SAN with LVM (was: Re: [Xen-users]Livemigration problem)

[Alain BARTHE <alain.barthe@xxxxxxxx>]

xen-users-bounces@xxxxxxxxxxxxxxxxxxx a écrit sur
10/01/2008 19:14:57 :

> Am Thursday, den 10 January hub Alain BARTHE folgendes in die Tasten:
> 
> > We don't follow any how-to for that, but things are quiet simple.
> > We decided that a VG is dedicated for each domU, and one LV on
this VG for 
> > each disk of the domU (generally only one). We use naming rules
to avoid 
> > to get lost with this big amount of LVs.
> 
> I also use an LV for each partition of the DomU so you can access
the
> filesystems easily from the Dom0 in case of error.

We use an LV for the whole disk of the domU, so that
domUs may be installed the standard way from a distrib and a kick-start
which does the partition stuff. This way, domU are also more independant
from domU, and there is less LVs. To access domU partitions from the dom0,
we use "kpartx".

> 
> > When you want to migrate a domU, you must attach the SAN disk
on which 
> > resides the domU's VG to the target dom0, and you must activate
its LVs. 
> > The "xm migrate -l" may be runned, generally it succeeds...
except in some 
> > cases like the one I reported here.
> 
> So you have an own PV (as in a piece of the SAN) for each DomU?
> Or do I miss something?

Yes we have. Yes there is a lot of PV as pieces of
SAN. I don't personaly manage the SAN, but it don't seems to be a hard
stuff.

> 
> > Don't hesitate to ask me if you have further questions.
> 
> Thanks!
> 
> Ciao
> Max
> -- 
>    Follow the white penguin.
> 
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