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

From: Christine Caulfield <ccaulfie redhat com>
To: LVM general discussion and development <linux-lvm redhat com>
Subject: Re: [linux-lvm] CLVMD Simple method to get who holds a lock in a cluster
Date: Mon, 27 Jul 2009 13:30:56 +0100

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 thelock. But all it does is use the same debugfs interface you've alreadymentioned :-)


Chrissie

Follow-Ups:
- Re: [linux-lvm] CLVMD Simple method to get who holds a lock in a cluster
  - From: brem belguebli

References:
- [linux-lvm] CLVMD Simple method to get who holds a lock in a cluster
  - From: brem belguebli

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