Maximum user/group count:
JovianDSS supports up to 1000000 users and 1000000 groups from one domain, but it is required to have a very strong server machine that can handle it. We tested in our lab 100000 objects from all trusted domains (users + groups) and it worked without problems.
Maximum opened file handle count:
Maximum number of open file handles is limited to 400896.
Maximum length of a file name:
Maximum length of file name is limited to 240 characters (filename + extension)