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

Digimer linux at alteeve.com
Fri Jun 3 18:36:07 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.

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". :)

E-Mail:              digimer at alteeve.com
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