You're going to rename a node in a Failover Cluster.
You're wondering if something bad is going to happen.
In theory, no.
Practically, you can find that when you want to re-add the node in the cluster after having renamed the host, Hyper-V tolds you that you are already part of a cluster.
This is partially true. You've been part of a cluster, but now you've another name.
So in your mind may aroust the idea of evict the node.
Before proceedin with this step, read this article:
Ok, you match the 4th point, so "evict" the node is contemplated.
After evicting the node, Hyper-V won't re-add you as explained above.
Now Hyper-V tolds you that is not cleaned up.
OMG. And now?
From an elevated privileged prompt, run:
If the command succeeds, you have a clean node that is possible to re-add in the cluster.
A better way to accomplish this step is:
1 - Move all the VMs, Cluster Disk and witness disk in the node you don't want rename (say NodeA).
2 - Evict the NodeB from Failover Cluster, then rename host NodeB in NodeBNew.
3 - Now you can re-add the Node, after reboot, without the /forcecleanup step.