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

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

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

This may be useful for your problem.
This is receipt for Fedora, however, configuration and operation on Ubuntu
shoud not differ greatly.

Mirantis Inc.,

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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