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• • • Sequential :-   In CloudStack Resource Layer end point(host) is selected based on rand() function. selected host will perform/process copy command operation for volume creation. Behavior is sequential if the rand() function selects same host for every concurrent volume from snapshot create request. Since there is only one host which needs be handle multiple requests. So Host will copy the snapshot content to volume(s) one after one in sequential manner. 
      
      
    •  Parallel :-  Behavior is Parallel if the rand() function selects different host for every concurrent every concurrent volume from snapshot create requestcreate request. Host will copy the snapshot content to volume in parallel execution
      
      Note :     however there are limitations in the existing functionality due to rand() function has problem in handling multiple hosts. It needs to be addressed may be in next version releases.
      
      

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