On 03/22/2012 07:04 PM, Lentes, Bernd wrote: > > Hi, > > Andreas schrieb: >> >> On 03/22/2012 04:47 PM, Lentes, Bernd wrote: >>> Hi, >>> >>> thanks for the quick response. So the data is not destroyed if two >>> identicals VM's access the LV simultaneouslay ? I thought >>> it would be. I >>> will have stonith too. >>> What is about live migration ? Is it possible with my setup ? >> >> Well, if you want live migration you must _not_ use an "exclusive" vg >> but allow both nodes to access it simultaneously. > > Ok. > >> >> It is also possible to balance the VMs across the nodes. > > Running vm1 and vm2 on node1 and vm3 and vm4 on node2 ?
For example, yes. > >> >> The most important part in your setup regarding data protection is a >> working STONITH setup ... and a correctly configured clvm >> setup will not >> allow a node to activate a vg and its lvs without consensus about the >> cluster state and it coordinates changes to the metadata but >> it does not >> coordinate concurrent access to the data. >> >> That is within the responsibility of Pacemaker to start VMs >> only on one >> node ... and Pacemaker relies on STONITH to be certain about >> node states. > > I thought that cLVM prevents data corruption, if two identical VM's access > the corresponding lv simultaneously. > Ok, it does not. > > I will have STONITH (HP ILO Network Adapter). Works fine. Regards, Andreas -- Need help with Pacemaker? http://www.hastexo.com/now > > > Bernd > > Helmholtz Zentrum München > Deutsches Forschungszentrum für Gesundheit und Umwelt (GmbH) > Ingolstädter Landstr. 1 > 85764 Neuherberg > www.helmholtz-muenchen.de > Aufsichtsratsvorsitzende: MinDir´in Bärbel Brumme-Bothe > Geschäftsführer: Prof. Dr. Günther Wess und Dr. Nikolaus Blum > Registergericht: Amtsgericht München HRB 6466 > USt-IdNr: DE 129521671 > _______________________________________________ > Pacemaker mailing list: Pacemaker@oss.clusterlabs.org > http://oss.clusterlabs.org/mailman/listinfo/pacemaker > > Project Home: http://www.clusterlabs.org > Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf > Bugs: http://bugs.clusterlabs.org
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_______________________________________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org
