Storage cluster and Datastore design best practices

Does anyone have any recommendations for references when designing new storage clusters?

I've dug around but I can't find any "best practice" documentation that lays out a classical setup.

I know the basics like, "try not to have more than \~30 VMs per datastore", but other elements like recommended sizing, LUNS per cluster etc.

I'd be curious to hear about peoples experiences with setting up their environments.