So if we do not use clustered VG's will any changes made to a shared disk (non clustered filesystem) be visible to all cluster nodes ? Or does activating the VG resource effectively 'refresh' the LVM layout prior to any filesystem actions taking place in the event of a failover ?
We will have one OCFS2 volume so DLM and cLVM are requirements there either way. On Mon, Sep 10, 2012 at 8:44 PM, Lars Marowsky-Bree <l...@suse.com> wrote: > On 2012-09-10T11:06:15, David Morton <davidmorto...@gmail.com> wrote: > > > Not directly Pacemaker related but a simple question for those who manage > > clusters ... > > > > I'm recreating our failover cluster on a new SAN which will use cLVM and > > XFS, I am after some clarification that the "--clustered y" directive is > > the correct and appropriate way to create the volume groups as the LVM > > layout will be visible to both cluster nodes at all times regardless of > the > > filesystem mount state ? > > > > I'll then create LVM resources in Pacemaker to control the activation of > > the volume groups prior to filesystem mounting. > > If you're using an LVM resource to activate/deactivate the VG in a > fail-over setting, there is no need to use a clustered volume group. > > You gain some protection against admin mistakes by not exposing the VG, > and if you do not need concurrent access to the VG, you can skip using > the DLM/cLVM2, which reduces complexity. > > > Regards, > Lars > > -- > Architect Storage/HA > SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix > Imendörffer, HRB 21284 (AG Nürnberg) > "Experience is the name everyone gives to their mistakes." -- Oscar Wilde > > > _______________________________________________ > 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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