[linux-lvm] some principal questions about cLVM

[Lentes, Bernd]

Sebastian wrote:

>       Hello,
>
>       with clvm you can have the same VG shared/activated on several nodes.
>       You'll then choose where you want the LVs activated in your cluster config.
>       You can activate some of the LVs on 1 node, and the other LVs on another node.
>
>       Regards,
>       --Sebastien

Hi,

thanks for your answer. Can i use one VG for all LV's ? That would be easier than providing for every LV a seperate VG.
Is it better to implement cLVM as a ressource, managed by pacemaker, or should i start cLVM using the normal way (Skript in /etc/init.d) ?


Bernd



        2012/6/5 Lentes, Bernd <bernd.lentes at helmholtz-muenchen.de>


>>              Hi,
>>
>>              i'm new to cLVM. I used "normal" LVM several times, and i like it.
>>              I want to establish a two node cluster. As resources i have VM's (using KVM). Furthermore i will have a FC SAN.
>>              I'd like to build PV, then VG and finally LV's on top of the SAN. Every VM will reside in one LV.
>>              Is that ok ?
>>              My question is now: When i create virtual disks in my SAN, do i have to create a Virtual Disk (or LUN) on my SAN, then PV, VG and finally LV for every VM
>>              Or can i create ONE Virtual Disk (LUN) in my SAN, on top of that create ONE PV and ONE VG and finally for every VM one LV ? This would be easier.
>>
>>              I'd like to have the VM's distributed between the two nodes, as a kind of Load-Balancing.
>>              Is it possible that the VG is running on both nodes simultaneously, having some LV's (and thereby some VM's) running on node 1 and others on node 2 ?
>>
>>              Thanks for any answer.
>>
>>
>>              Bernd


                --
                Bernd Lentes

                Systemadministration
                Institut für Entwicklungsgenetik
                HelmholtzZentrum münchen
                bernd.lentes at helmholtz-muenchen.de
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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