text: **Chapter 7. Volumes**
  
  In IBM Spectrum Virtualize, a*volume*is an amount of storage space that is provisioned out of 
  a storage pool and 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. The first part of this chapter provides a brief overview of IBM Spectrum Virtualize 
  volumes, the classes of volumes available, and available volume customization options. 
  
  The second part of this chapter describes how to create volumes by using the GUI and shows 
  you how to map these volumes to hosts. 
  
  The third part of this chapter provides an introduction to volume manipulation from the 
  command line interface (CLI). 
  
  This chapter includes the following topics: 
  
  (cid:2) 7.1, “Introduction to volumes” on page 242 
  (cid:2) 7.2, “Creating volumes” on page 258 
  (cid:2) 7.3, “Creating custom volumes” on page 265 
  (cid:2) 7.4, “HyperSwap volumes” on page 269 
  (cid:2) 7.5, “I/O throttling” on page 273 
  (cid:2) 7.6, “Mapping a volume to a host” on page 278 
  (cid:2) 7.7, “Migrating a volume to another storage pool” on page 281 
  (cid:2) 7.8, “Volume operations by using the CLI” on page 288 
  (cid:2) , “You can identify the back-end storage that is presenting the LUN by using the value of 
  the controller_name field that was returned for the MDisk.” on page 316 