text: Allocated storage is identified as storage that is allocated to a specific host (and unusable to 
  other hosts), whether data is written. For thin-provisioning, the data that is written is 
  considered used. For thick provisioning, total allocated volume space is considered used. 
  
  IBM Storage Utility Offerings include the IBM FlashSystem 900 (9843-UF3), IBM Storwize 
  V5030 (2078-U5A), and Storwize V7000 (2076-U7A) storage utility models that enable 
  variable capacity usage and billing. 
  
  These models provide a fixed total capacity, with a base and variable usage subscription of 
  that total capacity. IBM Spectrum Control Storage Insights is used to monitor the system 
  capacity usage. It is used to report on capacity that is used beyond the base subscription 
  capacity, which is referred to as variable usage. The variable capacity usage is billed on a 
  quarterly basis. This feature enables customers to grow or shrink their usage, and pay for 
  configured capacity only. 
  
  IBM Storage Utility Offering models are provided for customers who can benefit from a 
  variable capacity system, where billing is based on provisioned space above the base. The 
  base subscription is covered by a three-year lease that entitles the customer to use the base 
  capacity at no additional cost. If storage needs increase beyond the base capacity, usage is 
  billed based on the average daily provisioned capacity per terabyte, per month, on a quarterly 
  basis. 