Error something related to DRS,
Can you try creating the cluster with DRS and HA disabled and once created enable DRS/HA.
Guess I forgot to mention that DRS and vSphere HA was of at creation. As well as vSAN and EVC.
Is there any limitation to amount of clusters with a vSphere Standard license? We currently have three clusters with a total of seven hosts.
Can you restart the vcenter service once and try again?
VCSA has been rebooted multiple times at this point but when trying to create a new cluster I still get the same error.
I had the same problem with our 6.5 Appliance. After some search I found that the /storage/log is full - VMware Knowledge Base
I solved this problem and was able to add the new cluster without vCenter reboot.