text: Also, regardless of their relative capacities, both levels of cache tend to play an important role 
  in enabling sequentially organized data to flow smoothly through the system. 
  
  However, Storwize V7000 cannot increase the throughput potential of the underlying disks in 
  all cases. Performance benefits depend on the underlying storage technology and the 
  workload characteristics, including the degree to which the workload exhibits hotspots or 
  sensitivity to cache size or cache algorithms. 