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I just deployed a Witness VM (ESXi) for our first 2 node cluster and after setting the IP and reboot it gets the host name NTNX-<IP NUMBER>-A-CVM.
Since it seems the witness VM is a kind of CVM I assume it wants to use the NTNX-<NAME>-CVM naming convention or it is OK to set the host name to whatever?
Worked fine using  “sudo /usr/local/nutanix/cluster/bin/change_cvm_hostname <hostname>” to set the host name. 

Hello @Tedevil 

I’m not sure, but as you mentioned Witness VM is nothing but kinda like CVM. 

According to the following official documentation for the “NONCONFIGURABLE AHV COMPONENTS”
https://portal.nutanix.com/#/page/docs/details?targetId=AHV-Admin-Guide-v511:ahv-nonconfigurable-components-r.html

“Settings and contents of any Controller VM, including the name and the virtual hardware configuration (except memory when required to enable certain features).”

I advise not to go ahead and change the Witness VM name. 

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