What are the limitations of the XDN cache?
What is the largest file size you can cache?
Are there any limitations in terms of how many files you can cache or the total size of files you can cache?
In XDN the largest file size that can be cached is 2GB, where GB is 2^30 bytes. There are no hard limitations to the number of files and the total size of the files but all XDN sites run on a shared global caching infrastructure and the amount of cached data and the time it gets to live in the cache will depend on the traffic volume and mixture on any particular global point of presence (POP).
I will update our limits page with more information.