What is spm-lock.log file on RHEV Hypervisor?

Solution In Progress - Updated -

Issue

Sometimes there is spm-lock.log file available on RHEV Host at /var/log/vdsm/.
Sometimes it is not there and it does not show up after vdsmd restart.
What is this log file?
Who creates it and when?

Environment

Red Hat Enterprise Virtualization (RHEV) 3.x

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