Hey,
You can remove disk from CSV and will not destroy data. You can join your node to another domain, create a new cluster and add storage to CSV. This process requires downtime of your VMs and I highly recommend to backup your data. Should help: https://learn.microsoft.com/en-us/windows-server/failover-clustering/cluster-domain-migration
It would be much easier to move your VMs to another cluster, move nodes to another domain and create cluster in a new domain. You can then move your VMs back. It could be done without downtime Live Migrating your VMs to a different cluster. In addition, you should have shared storage for the cluster. StarWind VSAN can be used to replicated storage pool for a Failover Cluster. https://www.starwindsoftware.com/starwind-virtual-san
Cheers,
Alex Bykovskyi
StarWind Software
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