4.6.4 SAN boot support 4.7 Licensing and features 4.7.1 IBM FlashSystem 9100 products licenses  4.7.2 SAS Expansion Enclosures 4.7.3 Externally virtualized expansion enclosures or external arrays Chapter 4. Planning  109 In addition to one of these licenses, the capacity of each enclosure or array has an SCU value  applied.  Note:  IBM FlashSystem 9100  internal  enclosures are licensed to the hardware (HW)  serial number. IBM Spectrum Virtualize software and VSC packages are perpetual and not  tied to any HW serial number. Each externally virtualized expansion enclosure or storage array requires  one  of the following  licenses: Note:  Each IBM FlashSystem 9100 Expansion Enclosure Base Model A9F requires a  quantity of  four licenses per enclosure. The IBM FlashSystem 9100 Expansion  Enclosure Base Model AFF only requires a quantity of  one license per enclosure. Each SAS expansion enclosure requires the following license:  The following functions and features are included in the base IBM FlashSystem 9100  products licenses: The following licenses are for the IBM FlashSystem 9100 base products: The following topics cover base product licenses and feature licensing. The IBM FlashSystem 9100 supports SAN boot or startup for IBM AIX, Microsoft Windows  Server, and other operating systems. SAN boot support can change, so check the IBM SSIC  web page regularly. GLYPH<SM590000> IBM FlashSystem 9110 Base Model AF7- PID 5639-FA2 GLYPH<SM590000> IBM FlashSystem 9150 Base Model AF8- PID 5639-FA3 GLYPH<SM590000> Enclosure Virtualization GLYPH<SM590000> Thin Provisioning GLYPH<SM590000> FlashCopy GLYPH<SM590000> Encryption GLYPH<SM590000> Easy Tier GLYPH<SM590000> DRP Compression GLYPH<SM590000> IBM FlashSystem 9100 Expansion Enclosure Base Model AFF- PID 5639-FA1 GLYPH<SM590000> IBM Spectrum Virtualize for SAN Volume Controller: PID 5641-VC8 or GLYPH<SM590000> IBM Virtual Storage Center (VSC): PID 5648-AE1 