Hello Lentes,
>>> > Hi, > > i have a 2-node-cluster with my services (web, db) running in VirtualDomain > resources. > I have a SAN with cLVM, each guest lies in a dedicated logical volume with > an ext3 fs. > > Currently i'm thinking about snapshoting the guests to make a backup in the > background. With cLVM that's not possible, you can't snapshot a lustered lv. > Using virsh and qemu-img i didn't find a way to do this without a shutdown > of the guest, which i'd like to avoid. > > I found that ocfs2 is able to make snapshots, oracle calls them reflinks. > So formatting the logical volumes for the guests with ocfs2 would give me > the possibility to snapshot them. > > I know that using ocfs2 for the lv's is oversized, but i didn't find another > way to solve my problem. Yes, OCFS2 reflink can meet your requirement, this is also why ocfs2 introduces file clone. > > What do you think ? I'd like to avoid to shutdown my guests, that's too > risky. I experienced already several times that a shutdown can last very long > because of problems with umounting filesystems because of open files or user > connected remotely (on windows guests). Just one comments, you have to make sure the VM file integrity before calling reflink. Thanks Gang > > > Bernd > > -- > > Bernd Lentes > Systemadministration > Institut für Entwicklungsgenetik > Gebäude 35.34 - Raum 208 > HelmholtzZentrum münchen > [ mailto:bernd.len...@helmholtz-muenchen.de | > bernd.len...@helmholtz-muenchen.de ] > phone: +49 89 3187 1241 > fax: +49 89 3187 2294 > [ http://www.helmholtz-muenchen.de/idg | > http://www.helmholtz-muenchen.de/idg ] > > no backup - no mercy > > > Helmholtz Zentrum Muenchen > Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) > Ingolstaedter Landstr. 1 > 85764 Neuherberg > www.helmholtz-muenchen.de > Aufsichtsratsvorsitzende: MinDir'in Baerbel Brumme-Bothe > Geschaeftsfuehrer: Prof. Dr. Guenther Wess, Heinrich Bassler, Dr. Alfons > Enhsen > Registergericht: Amtsgericht Muenchen HRB 6466 > USt-IdNr: DE 129521671 > > > _______________________________________________ > Users mailing list: Users@clusterlabs.org > https://lists.clusterlabs.org/mailman/listinfo/users > > Project Home: http://www.clusterlabs.org > Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf > Bugs: http://bugs.clusterlabs.org _______________________________________________ Users mailing list: Users@clusterlabs.org https://lists.clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org