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

brem belguebli brem.belguebli at gmail.com
Mon Jul 27 12:48:33 UTC 2009

Hi Chrissie,

RHEL 5.3 shipped  cman-2.0.9-1.el5, any updated RPM available for RHEL 5.3 ?



2009/7/27, Christine Caulfield <ccaulfie at redhat.com>:
> 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 :-)
> Chrissie
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