Can someone please tell vsan Object space reservation (%) best practices I know 0 is thinn provision and 100 is thick. In production is it best to use thick?
I do not want to run out of disk space
I don't think there's best practice for Object space reservation (%). It totally depends on your requirement. If you want to preserve storage, thin is the way to go. Else go for thick. Either way, it all depends on VM sizing and requirement.
Some background into your current infrastructure (Physical server model, Disk group configuration, ESXi version, vSAN version, vSAN policies configured) and the requirement from which your current query stems from would be helpful here.