text: **2.5.20 Real-time Compression**
  
  IBM Real-time Compression is an attractive solution to address increasing data storage 
  requirements for power, cooling, and floor space. When applied, IBM Real-time Compression 
  can significantly save storage space because more data is stored in rack space so fewer 
  storage enclosures are required to store a data set. IBM Real-time Compression provides the 
  following benefits: 
  
  (cid:2) Compression for active primary data. IBM Real-time Compression can be used with active 
  primary data. 
  
  (cid:2) Compression for replicated/mirrored data. Remote volume copies can be compressed in 
  addition to the volumes at the primary storage tier. This process also reduces storage 
  requirements in Metro Mirror and Global Mirror destination volumes. 
  
  (cid:2) No changes to the environment are required. IBM Real-time Compression is part of the 
  storage system. 
  
  (cid:2) Overall savings in operational expenses. More data is stored in a rack space, so fewer 
  
  storage expansion enclosures are required to store a data set. This reduced rack space 
  has the following benefits: 
  
  – Reduced power and cooling requirements. More data is stored in a system, which 
  requires less power and cooling per gigabyte or used capacity. 
  
  – Reduced software licensing for more functions in the system. More data stored per 