[ClusterLabs] Antw: Re: principal questions to a two-node cluster

Lentes, Bernd bernd.lentes at helmholtz-muenchen.de
Thu Apr 23 09:53:49 EDT 2015

Michael wrote:
> >
> > - If I will use logical volumes, do I need cLVM ? Or is "normal" LVM
> > sufficient ?
> If you want your LVMs either on the left or the right node, plain LVM is
> sufficient. If you want part or your LVMs to run on the left node while
> the other parts runs on the right node, you need cLVM. And DLM.

I'd like to have some VM's running on node A and some _others_ on node B.
So I will use cLVM.

>  - snapshots with cLVM now seems to work:
> > https://www.suse.com/releasenotes/x86_64/SLE-HA/11 SP3/#id303161 (I
> > will use SLES 11 SP3) - I'd like to have snapshots. Freezing systems
> > before applying software or changing configuration is fine. How can I
> achieve it ?
> What do you mean with freezing?

Preserving the state of a system before applying patches, new scripts, additional software.

> > How is the setup with cLVM ? This is my idea:  SAN offers one or more volumes to the
> > nodes ==> disks which appears in the nodes from the SAN are used as
> > physical volumes ==> physical volume/s are combined to a volume
> > group ==> logical volumes are created on top of this vg, one lv for every
> > virtual machine ==> formatted with a file system like ext3 (because
> > each virtual machine does not run concurrently on both nodes this
> > should work) ==> each virtual machine in a raw file, one vm for each
> > lv . Does that work ? Possible to run different virtual machines on
> > different nodes concurrently (as a poor load balancing) ?

What do you think about this setup ?

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