text: **3.19.3 Storwize V7000**
  
  The Storwize V7000 clustered system is scalable up to eight nodes. Its performance grows 
  nearly linearly when more nodes are added until it becomes limited by other components in 
  the storage infrastructure. Although virtualization with the Storwize V7000 provides a great 
  deal of flexibility, it does not abolish the necessity to have a SAN and back-end storage 
  subsystems that can deliver the performance that you want. 
  
  Essentially, Storwize V7000 performance improvements are gained by using in parallel as 
  many physical disks as possible, which creates a greater level of concurrent I/O to the 
  back-end storage without overloading a single disk or array. 
  
  Assuming that no bottlenecks exist in the SAN or on the disk subsystem, you must follow 
  specific guidelines when you perform the following tasks: 
  
  (cid:2) Creating a storage pool 
  
  (cid:2) Creating volumes 
  
  (cid:2) Connecting to or configuring hosts that use storage presented by a Storwize V7000 
  clustered system 
  
  For more information about performance and preferred practices for the Storwize V7000, see 
  IBM System Storage SAN Volume Controller and Storwize V7000 Best Practices and 
  Performance Guidelines, SG24-7521. 