[RHEV] Why might a Virtual Machine's Disk show an Actual Size is greater than its Virtual Size?

Solution Verified - Updated -

Issue

  • Some of the virtual machines in RHEV are exceeding the disk storage allocated to them.

  • While checking from inside the virtual machine, it is utilizing far less from what was allocated. Why there is a difference like this?

Environment

  • Red Hat Enterprise Virtualization (RHEV) v2.2
  • Red Hat Enterprise Virtualization (RHEV) v3.x
  • Red Hat Virtualization (RHV) v4.x

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