So there are a few virtual machines set to be thick provisioned on space. We can convert this to thin to get some space back. The warning to due to high space usage. The only way around is to add more node for added space or convert thick vm's to thin.
These warning are meant for overall space usage. If you lose a node things would be tighter but OK
NCC seems fine other than high usage warning.
Let me know what you want to do next. If you want us to convert from thick to thin or look at adding more nodes.