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  1. Home
  2. IT Analytics Help
  3. Section V. Report Reference
  4. Array Capacity Utilization Reports
  5. Space-efficient VDisks

Space-efficient VDisks

A Virtual Disk (VDisk) can be configured as space-efficient, which means that it has both virtual and real capacity.

  • Virtual Capacity - VDisk storage that is available to hosts

  • Real Capacity - Physical storage from an MDisk that is allocated to a VDisk copy

For a fully allocated VDisk (all real capacity), virtual and real capacity are identical; however, in a space-efficient VDisk, virtual capacity can exceed real capacity.

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IBM SAN Volume Controller Overview

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IBM SVC VDisk Summary

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