[DRBD-user] "Simple" LVM without clvmd?

Oleg Gelbukh ogelbukh at mirantis.com
Thu Jun 9 11:04:09 CEST 2011


This may be useful for your problem.
http://mirantis.blogspot.com/2011/06/clustered-lvm-on-drbd-resource-in.html
This is receipt for Fedora, however, configuration and operation on Ubuntu
shoud not differ greatly.

WBR,
Oleg
Mirantis Inc.,
http://www.mirantis.com

On Fri, Jun 3, 2011 at 8:36 PM, Digimer <linux at alteeve.com> wrote:

> On 06/03/2011 10:42 AM, Pete Ashdown wrote:
>
>> Thank you for your help. I would like both hosts to be able to
>> manipulate the LVM and run in dual primary mode. There isn't a whole lot
>> of manipulation going on, and certainly not simultaneous.
>>
>
> The short answer to your earlier question of using LVM without CLVM on
> Primary/Primary is "no".
>
> The reason is;
> - Primary/Primary requires distributed locking, DLM.
> - DLM requires a closed process group (CPG), which comes from a formed
> cluster; Corosync provides this.
> - Corosync requires fencing/stonith to properly deal with faults in the
> cluster when shared storage is in use.
>
> Corosync runs just fine on Ubuntu; The problem is likely a configuration
> issue of the CIB. I'd suggest joining the Pacemaker/OpenAIS (the predecessor
> to corosync) mailing lists, and if you are on IRC, stop by the
> #linux-cluster channel.
>
> Getting a working cluster is not that difficult, but it does require
> understanding the fundamentals. Once you have the cluster formed, you will
> find that CLVM works just fine. It certainly doesn't lock LVs "for not
> reason". :)
>
> --
> Digimer
> E-Mail:              digimer at alteeve.com
> Freenode handle:     digimer
> Papers and Projects: http://alteeve.com
> Node Assassin:       http://nodeassassin.org
> "I feel confined, only free to expand myself within boundaries."
>
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