Cache Size on Mirage Server

Hi,

on the Mirage Server we've defined a drive D: with 100GB for Caching.

The dirve is filled up to 99%.

What is the prefered size for the Cache dir?

Allocates mirage at every time the full disk space?

Is it possible to Redirect the Cache dir in a unc path an set a Limit for the max Cache size?

Thanks in advance