Re: [Xen-users] Debian Etch Xen Cluster (DRBD, GNBD, OCFS2, iSCSI, Heartbeat?)

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

Goswin von Brederlow wrote:
> Dominik Klein <dk@xxxxxxxxxxxxxxxx> writes:
>
>   
> > Mehdi AMINI schrieb:
> >     
> > > > Just remember, if something goes wrong in such a way that the domain is
> > > > active on both nodes at the same time with read/write access to the
> > > > filesystem, you *will* *destroy* the filesystem and will need to restore
> > > > from backup. No amount of fscking will help you.
> > > >         
> > > This is precisely the goal of OCFS, each node can mount a block device
> > > read/write at the same time :)
> > >       
> > But still, you don't want to have two servers write to the root
> > filesystem simultaneusly, do you?
> >     
> 2 Things to think about:
>
> 1) Do what you would do without xen. Throw the power switch.
>
> That means you have to teach stonit or heartbeat about xen and the
> power switch becomes "xm destroy" on the other node instead of a real
> power switch.
>
> 2) Would it make sense to have a bit in the lvm headers to show that a
> volume is active and have cluster lvm respect that bit and prevent a
> second activation if run wihtout force?
>
> Maybe instead of a bit an UUID of the activator would be best. If you
> can get a UUID that differs between the physical machines running the
> domUs.
>
> MfG
>         Goswin
>   
Hmm. You know, you can rename an LVM partition while Xen has it mounted. 
This might be a useful trick to prevent another Xen guest from mounting it.
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