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Create vdsm.conf options to enable/disable sanlock.
Default should be disable.

A patch has been proposed upstream:

commit 2a0acf123c758ad999b0a81dbfbb9cdde03291a1
Author: Federico Simoncelli <fsimonce>
Date:   Wed Jul 11 13:42:37 2012 +0000

    BZ#838802 Config option to enable/disable volume leases
    
    Signed-off-by: Federico Simoncelli <fsimonce>
    Change-Id: I3950be962f89c934f617752bbf1c79c61d400bda

http://gerrit.ovirt.org/#/c/6188/

vdsm-4.9.6-24.0.

Enabling the use_volume_leases generates the following section in the vm's domain xml file:
<lease>
      <lockspace>94e13138-9e52-46be-b50c-4ac0bcec0cf2</lockspace>
      <key>e4854f6c-2b3d-4e71-b339-e2c65c2872d1</key>
      <target path='/dev/94e13138-9e52-46be-b50c-4ac0bcec0cf2/leases' offset='110100480'/>
    </lease>

By default use_volume_leases disbaled.
Disabling the use_volume_leases (use_volume_leases=false) disables it.

Fixed.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2012-1508.html