While upgrading five hosts in a vSphere cluster, the maintenance window ends. The customer does not allow you to extend the window, so now the cluster is running the hosts at different build levels. There are two hosts at the new build version, and three hosts at the previous build version. There are 11 virtual machines protected by VMware Fault Tolerance in the cluster. You now see the following error No suitable host can be found to place the Fault Tolerance Secondary VM for virtual machine SalesVM.
What is the cause of this error?

Question

While upgrading five hosts in a vSphere cluster, the maintenance window ends. The customer does not allow you to extend the window, so now the cluster is running the hosts at different build levels. There are two hosts at the new build version, and three hosts at the previous build version. There are 11 virtual machines protected by VMware Fault Tolerance in the cluster. You now see the following error No suitable host can be found to place the Fault Tolerance Secondary VM for virtual machine SalesVM.

What is the cause of this error?

Trang Anna · Accepted Answer

Fault Tolerance requires that the hosts for the primary and secondary virtual machines use the same host build number and patch level.

Trang Anna · Answer

Fault Tolerance has detected a difference between the primary and secondary virtual machines.

Trang Anna · Answer

Fault Tolerance will not create a Secondary virtual machine in a cluster with mixed build versions.

Trang Anna · Answer

VMware HA will not function properly in a cluster with mixed build versions, which prevents Fault Tolerance from creating a secondary virtual machine.

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