Description of problem:

A command may create several tasks during its execution.
If the command created X tasks out of Y (I.E - vdsm began running X tasks, async_tasks table has X records for the command) and the command crashes, upon restart, the command ends successfully (the tasks information is being retrieved from the data center, the tasks are being polled, and when they end successfully, they cause the command to end successfully as well) 
although not all tasks for it were executed.

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