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Date: Mon, 27 Jul 2009 14:25:15 +0200
Message-ID: <29ae894c0907270525v63f0a334n464bb49ea60f71cf@mail.gmail.com>
From: brem belguebli <brem.belguebli@gmail.com>
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Subject: [linux-lvm] CLVMD Simple method to get who holds a lock in a cluster
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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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<div>Hi,</div>
<div>=A0</div>
<div>In a clustered environment, without GFS, we plan to use CLVMD exclusiv=
e activation of VG&#39;s in order to prevent a VG to be activated on more t=
han 1 node at a time.</div>
<div>=A0</div>
<div>I&#39;ve been looking for how to check who holds a lock for a given VG=
 but I could&#39;nt find no suitable way to do it.</div>
<div>=A0</div>
<div>The only way was to activate debug (=A0mount -t debugfs debug /debug) =
and cat /debug/dlm/clvmd_locks.</div>
<div>=A0</div>
<div>Is there a way to request dlm (via dlm_tool) to get the lock holding n=
ode or via=A0=A0any LVM command.</div>
<div>=A0</div>
<div>Regards</div>

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