1.3.1 IBM Storage Utility Offerings  The IBM 2078 Model U5A is the IBM Storwize V5030 with a three-year warranty, to be used in  the Storage Utility Offering space. These models are physically and functionally identical to  the Storwize V5030 model 324 with the exception of target configurations and variable  capacity billing. The variable capacity billing uses IBM Spectrum Control™ Storage Insights  to monitor the system usage, which allows allocated storage usage above a base  subscription rate to be billed per TB, per month.  Allocated storage  is identified as storage that is allocated to a specific host (and unusable to  other hosts), whether data is written or not. 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 several IBM storage products. For more information  these products, see this website. IBM Storage Utility Offering models enable a 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 used beyond the base subscription capacity, which is  referred to as  variable usage . The variable capacity usage is billed on a quarterly basis. This  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 actual 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 TB, per month, on a  quarterly basis. A customer has a Storwize V5030 utility model with 2 TB nearline disks, for a total system  capacity of 48 TB. The base subscription for such a system is 16.8 TB. During the months  where the average daily usage is below 16.8 TB, there is no additional billing. The system monitors daily provisioned capacity and averages those daily usage rates over  the month term. The result is the average daily usage for the month. If a customer uses 25 TB, 42.6 TB, and 22.2 TB in three consecutive months, Storage  Insights calculates the overage as follows (rounding to the nearest terabyte) as listed in  Table 1-7. The capacity that is billed at the end of the quarter is a total of 39 TB-months in this example. Disk expansions (2076-24F for the Storwize V7000 and 2078-24F for the Storwize V5030)  can be ordered with the system at the initial purchase, but cannot be added through MES.  The expansions must have like-type and capacity drives, and must be fully populated.  Table 1-7 Overage calculation Average daily Base Overage To be billed 25.0 16.8 8.2 8 42.6 16.8 25.8 26 22.2 16.8 5.4 5 Example 10  Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.2.1