20. The data storage device of claim 19 , further including instructions causing the processor nodes to each sort the local index of identified array of reservoir data blocks allocated to that node.
20. The data storage device of claim 19 , further including instructions causing the processor nodes to each sort the local index of identified array of reservoir data blocks allocated to that node. 21. The data storage device of claim 20 , further including instructions causing the processor nodes to form a list of the sorted local index of identified array of reservoir data blocks allocated to that node.