7 Volumes In IBM Spectrum Virtualize, a  volume  is an amount of storage space that is provisioned out of  a storage pool. The volume is presented to a host as a SCSI logical unit (LU), that is, a logical  disk. This chapter describes how to create and provision volumes on IBM Spectrum Virtualize  systems.  This chapter includes the following topics: GLYPH<SM590000> Part one reviews IBM Spectrum Virtualize volumes, the classes of volumes that are  available, and the volume customization options that are available. GLYPH<SM590000> Part two describes how to create volumes by using the GUI, and shows you how to map  these volumes to hosts. GLYPH<SM590000> Part three introduces volume manipulation from the command line interface (CLI). GLYPH<SM590000> An introduction to volumes GLYPH<SM590000> Creating volumes GLYPH<SM590000> Stretched volumes GLYPH<SM590000> Stretched volumes GLYPH<SM590000> HyperSwap volumes GLYPH<SM590000> I/O throttling GLYPH<SM590000> Mapping a volume to a host GLYPH<SM590000> Migrating a volume to another storage pool GLYPH<SM590000> Volume operations in the CLI ' Copyright IBM Corp. 2011, 2019. All rights reserved. 263