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Re: [linux-lvm] some principal questions about cLVM



2012/6/7 Lentes, Bernd <bernd lentes helmholtz-muenchen de>


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

Hi,

Yes you can have only 1 VG holding all your LVs.
Let clvmd start normally at boot time, it will take care of the shared VG.
In your cluster config, you'll only manage LV and FS as resources.

--Sebastien
 

       2012/6/5 Lentes, Bernd <bernd lentes 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

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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

_______________________________________________
linux-lvm mailing list
linux-lvm redhat com
https://www.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/


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