How much of datastore should be left for the host its own to run

Hi all,

I have EXSI 5.5 host installed recently. I am going to create a new VM machine on that host but the datastore on that host is about 2TB and I want to set 1.8TB for my VM machine so I only have 0.2 TB left. The question is that with 0.2 TB left there, whether it is enough for the host to run its own code and data structures? How to determine how many should be left?. The same question for memory and CPU usage.

Could you please help on this?

Thanks a lot.

Regards,

Thao