text: **10.7 Data deduplication and compression on external storage**
  
  Starting from IBM Spectrum Virtualize V8.1.x, it supports over-provisioning on selected 
  back-end controllers. This means that if back-end storage performs data deduplication or data 
  compression on LUs provisioned from it, they still can be used as external MDisks on IBM 
  Storwize V7000. 
  
  Thin-provisioned MDisks from controllers that are supported by this feature can be used as 
  managed mode MDisks in IBM Storwize V7000 and added to storage pools (including DRPs). 
  
  Implementation steps for thin-provisioned MDisks are same as for fully allocated storage 
  controllers. Extra caution is used when planning capacity for such configurations. 