Each Storwize V5000 Expansion Enclosure uses Storwize Family Software for Storwize V5000 Expansion Software, Storwize Family Software for Storwize V5000 Expansion software license is required for each expansion enclosure. In addition to this expansion enclosure license, advanced functions are available for purchase as feature codes of the software. For example, if you are running a Storwize V5000 system and want to improve performance efficiencies with Easy Tier, you may purchase that feature code to use Easy Tier across all the control enclosures, expansion enclosures, and externally virtualized enclosures configured with that system, and proceed to use Easy Tier for that Storwize V5000 system.