Description of problem:

This bugzilla should serve as a placeholder for improvement of lvmetad.

At this moment we are struggling on initial 'pvscan --cache' which actually does whole 'internal' scan anyway - so avoid usage of deadlock when reading devices ourself.

Also we want to allow 'autoactivation'  without actually having 'lvmetad' running.

We should have clear  'state-machine' which does not miss any state change of device and yet doesn't require our tool to 'scan' all system devices.

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