In Server Manager, you can set predefined limits for the caching server. Is it possible to set a custom limit? Maybe through Terminal? How do I do this?
I want to limit caching to 100GB but my options are 25GB or 270GB or 755GB or Unlimited.
Your options aren't limited to the numbers printed below the scroll bar. You can drag between the options to select a value closer to your desired value:
You can set custom values if you really want to though. The cache size is stored in the CacheLimit key in the configuration plist which is located by default here:
The integer is bytes.