[linux-lvm] CLVMD Simple method to get who holds a lock in a cluster

Christine Caulfield ccaulfie at redhat.com
Mon Jul 27 12:30:56 UTC 2009

On 07/27/2009 01:25 PM, brem belguebli wrote:
> Hi,
> In a clustered environment, without GFS, we plan to use CLVMD exclusive
> activation of VG's in order to prevent a VG to be activated on more than
> 1 node at a time.
> I've been looking for how to check who holds a lock for a given VG but I
> could'nt find no suitable way to do it.
> The only way was to activate debug ( mount -t debugfs debug /debug) and
> cat /debug/dlm/clvmd_locks.
> Is there a way to request dlm (via dlm_tool) to get the lock holding
> node or via  any LVM command.
> Regards

Depending on the version you have dlm_tool will show you who holds the 
lock. But all it does is use the same debugfs interface you've already 
mentioned :-)


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