[Linux-cluster] Fwd: CLVM exclusive mode

[brem belguebli]

Hi Rafael,
Good testing, it confirms that some additional barriers are necessary to
prevent undesired behaviours.

I'll test by tomorrow the same procedure at VG level.



2009/7/30 Rafael Micó Miranda <rmicmirregs at gmail.com>

> Hi Brem
>
> El jue, 30-07-2009 a las 09:15 +0200, brem belguebli escribió:
> > Hi,
> >
> > does it look like we're hiting some "undesired feature" ;-)
> >
> > Concerning the 0 nodeid, I think I read that on some Redhat documents
> > or bugzilla report, I could find it out.
> >
> > Brem
> >
> >
> >
> >
> > --
> > Linux-cluster mailing list
> > Linux-cluster at redhat.com
> > https://www.redhat.com/mailman/listinfo/linux-cluster
>
> I made some test on my lab environment too, i attach the results in the
> TXT file.
>
> My conclusions:
>
> 1.- lovgols with exclusive flag must be used over clustered volume
> groups (obvious and already known)
> 2.- logvols activated with exclusive flag must be handled EXCLUSIVELY
> with the exclusive flag
>
> ---> as part of my lvm-cluster.sh resource script, the exclusive flag is
> part of the resource definition in cluster.conf so this is correctly
> handled
>
> 3.- you can activate an already active exclusive logvol on any node if
> you dont take into accout, during the activation, the exclusive flag
> 4.- in use (opened) logvols are protected from deactivation from
> secondary nodes, even from main node
> 5.- after a node failure (hang-up, fencing...) logvol is not open
> anymore, so it can be exclusively activated on a new node
>
> All this was tested manually, but this is the expected behaviour on
> lvm-cluster.sh resource script.
>
> Link to lvm-cluster.sh resource script:
>
> https://www.redhat.com/archives/cluster-devel/2009-June/msg00020.html
>
> Cheers,
>
> Rafael
>
> --
> Rafael Micó Miranda
>
> --
> Linux-cluster mailing list
> Linux-cluster at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-cluster
>
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