----- On Feb 3, 2017, at 8:38 PM, Digimer [email protected] wrote: >> And if i don't have a non cluster fs like btrfs, but just a plain lv ? >> Would live migration then be possible ? >> I'd like to have live migration. > > No. For a short period during the migration, data needs to be writable > from both nodes at the same time. To do this, you need to mount the FS > on both nodes at the same time. For that, you need a cluster-aware file > system, like GFS2, which uses DLM to coordinate locks. > > Alternatively, you can use clustered LVM LVs as the raw backing device, > no FS, and have the LVs active on both nodes at the same time. This is > how we do it. >
So just with plain LV and no FS live migration is possible ? >>>> I stumbled across sfex. It seems to provide an additional layer of security >>>> concerning access to a shared storage (my lv ?). >>>> Is it senseful, does anyone have experience with it ? >>>> >>>> Btw: Suse recommends >>>> (https://www.suse.com/documentation/sle_ha/book_sleha/data/sec_ha_clvm_config.html) >>>> to create a mirrored lv. >>>> Is that really necessary/advisable ? My lv's reside on a SAN which is a >>>> RAID5 >>>> configuration. I don't see the benefit and the need of a mirrored lv, >>>> just the disadvantage of wasting disk space. What do you think about sfex and mirrored lvm ? Thanks. Bernd 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: [email protected] http://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
