4 Virtualization concepts This chapter describes virtualization concepts as they apply to the DS8880.  This chapter covers the following topics: 105 ' Copyright IBM Corp. 2016, 2019. All rights reserved. GLYPH<SM590000> Virtualization definition GLYPH<SM590000> Benefits of virtualization GLYPH<SM590000> Abstraction layers for drive virtualization GLYPH<SM590000> Extent pools