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

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

[brem belguebli]

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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

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

[Christine Caulfield]

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

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

[brem belguebli]

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Hi Chrissie,

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

Thanks

Brem



2009/7/27, Christine Caulfield <ccaulfie@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
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>

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