text: (cid:2) Volumes with encrypted data have a low compression ratio, and are not good candidates 
  for compression. This observation is true for data that is encrypted by the host. Real-time 
  Compression can provide satisfactory results for volumes encrypted by Storwize V7000, 
  because compression is performed before encryption. 
  
  **3.19.5 Performance monitoring**
  
  Performance monitoring must be a part of the overall IT environment. For the Storwize V7000 
  and other IBM storage subsystems, the official IBM tool to collect performance statistics and 
  provide a performance report is IBM Spectrum Control. 
  
  For more information about using IBM Spectrum Control to monitor your storage subsystem, 
  see this website. 
  
  Also, see IBM Spectrum Family: IBM Spectrum Control Standard Edition, SG24-8321. 