code: @Override
  	public String startCreateSnapshot(String snapshotName) {
  		String jobID = consNextJobID();
  		String jobName = consJobName("createBackup", snapshotName);
  		LongJob job = getNode().consCreateSnapshotJob(jobID, jobName, snapshotName);
  		startJob(job);
  		return jobID;
  	}
docs: Starts the asynchronous operation (- "long job") that will create new
  data snapshot. The operation will be completed with FAILED status if
  storage node is not in NORMAL mode or specified snapshot already exists.
  
  @param snapshotName
  The name of snapshot.
  @exception java.lang.IllegalStateException
  if other job is executing currently.