text: **3.19 Performance considerations**
  
  Storage virtualization with the Storwize V7000 improves flexibility and simplifies management 
  of storage infrastructure, and can provide a substantial performance advantage. The Storwize 
  V7000 caching capability and its ability to stripe volumes across multiple disk arrays are the 
  reasons why usually significant performance improvements are observed when Storwize 
  V7000 is used to virtualize midrange back-end storage subsystems. 
  
  **Tip:**Technically, almost all storage controllers provide both striping (in the form of RAID 5, 
  RAID 6, or RAID 10) and a form of caching. The real benefit of Storwize V7000 is the 
  degree to which you can stripe the data across disks in a storage pool, even if they are 
  installed in different back-end storage systems. This technique maximizes the number of 
  active disks available to service I/O requests. The Storwize V7000 provides more caching, 
  but its impact is secondary for sustained workloads. 
  
  To ensure the performance that you want and verify the capacity of your storage 
  infrastructure, analyze performance and capacity to reveal the business requirements of your 
  storage environment. Use the analysis results and the guidelines in this chapter to design a 
  solution that meets the business requirements of your organization. 