The unused disk blocks of the virtual machine
While Enabling Fault Tolerance (FT) on virtual Machine, following error occurred.
The unused disk blocks of the virtual machine’s disks have not been scrubbed on the file system. This is needed to support features like Fault Tolerance.
Reason of Error:
Fault Tolerance cannot be enabled on a powered-on virtual machine that has thick formatted or lazy-zeroed disks.
To enable FT, power off the virtual machine, turn on FT, and power on the virtual machine again. This changes the disk format of the virtual machine.