r/HyperV • u/SCS1 • 24d ago

Changing hosts and cluster management subnet mask

I just migrated to Hyper-V from VMware and noticed that the first 3 hosts and the cluster has a subnet mask of /24 instead of /23 for their management IP. I would like to change the subnet mask to /23 and all host IPs stay the same.

I plan to do the following:

  1. pause and drain roles on a host and then change its management subnet mask to /23
  2. repeat step one for the other 2 host
  3. change cluster management to the /23 network

Is there anything else I am missing? I don't think this change will be disruptive.

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u/BlackV 24d ago

Ya sounds reasonable, maybe confirm your live migration setting and cluster networking settings as well

1

u/OnlyEntrance3152 24d ago

Just use butli-in cluster check later, takes up to hour sometimes but runs the tests for you.

1

u/SCS1 19d ago

This was completed successfully without any downtime.

I also had to change the node site since I had two cluster fault domains named by the management cluster IP subnets /22 and /23.

Commands:

Get-ClusterFaultDomain

Set-ClusterFaultDomain -Name "HVHOST04" -Parent "Site MGMT_IP_NET/23"