as we are moving more and more services to the cloud we want to downsize our data center.
We want to make 5 hosts to 2 hosts with less or no downtime.
We cannot use live migration as our storage is filled ~60%. The storage is being reused afterwards. So no (not yet) Azure Stack HCI with Storage Spaces Direct.
I have read about the rolling update of clusters. But this only describes one cluster being upgraded and not a merge.
Anyone can tell me a high level migration approach?