In SGOS V126.96.36.199 / V188.8.131.52 or later software, the maximum value you can specify for max-cache-size in the ProxySG appliance CLI and Management Console is dynamically configured based on the capability of the ProxySG model. For example, for an SG300-25-PR unit, the max-cache-size is 55993 MB. Previously, 32256 MB was the maximum value.
The default max-cache-size value is 10000 MB for newly installed software from 4096 MB. If the case of an upgrade from an old version, the value remains the same.