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Knowledge Base

Enabling Fault Tolerance on a virtual machine with an extended disk size fails with the error: Unsupported virtual machine configuration for Fault Tolerance (1021615)

Last Updated: 9/27/2020Categories: TroubleshootingTotal Views: 16190Language:
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Symptoms

Enabling Fault Tolerance (FT) on a virtual machine with an extended disk size fails

Cannot enable FT on a virtual machine with an extended disk size

You see an error similar to:

Unsupported virtual machine configuration for Fault Tolerance.
The Unused Disk blocks of the Virtual machine's disk have not been scrubbed on the filesystem. This is needed to support features like fault tolerance.

Cause

This issue occurs because FT cannot be enabled on a powered-on virtual machine that has thick formatted, lazy-zeroed disks.

Resolution

This is a known issue affecting VMware vCenter Server 4.0, 4.1, 5.0, and 5.1.

This issue is resolved in vCenter Server 6.0. For more information, see VMware vSphere 6.0 Release Notes

Related Information

For more information, see the VMware Availability Guide for your version of ESX.

Perform these steps to extend disk on a FT enabled virtual machine:

Power off the FT virtual machine.

Disable FT on the Primary virtual machine. For more information on disabling FT, see Disabling or turning Off VMware FT (1008026).

Extend the virtual disk. For more information on increasing the virtual disk, see Increasing the size of a virtual disk (1004047).

Note: When extending the vmdk using vmkfstools, use -d eagerzeroedthick to keep the disk-type for FT intact.

Enable Fault Tolerance on the Primary virtual machine.

Note: When enabling Fault Tolerance again, this causes the vmdk to become EagerZeroedThick. If the virtual disk is large, turning on FT can take some time to complete.

Power on the FT virtual machine.

To be alerted when this document is updated, click the Subscribe to Article link in the Actions box in the Actions box.
Increasing the size of a virtual disk
Disabling or turning Off VMware FT

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Additional Resources

KB
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End Of General Availability of the Free vSphere Hypervisor (ESXi 7.x and 8.x) (2107518)

KB
•
仮想マシンのハード ディスク使用率のアラームを設定する (2144546)

KB
•
Download and Install VMware Fusion (2014097)

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