From HELIOS Software:
HELIOS File System Test is an easy to use application to test file server compatibility. Every Macintosh user or system administrator can easily verify in a quick and reliable way if their file server is fully compatible with Mac OS X clients. The HELIOS File System Test can examine AFP, NFS, SMB/CIFS, and WebDAV network connections. The 11 tests check for the support of file sizes exceeding 4 GB, long file names, UTF-8 compatibility, correct file access rights, as well as the consistent use of file/directory IDs. If a server fails any tests, a detailed error message explains the issues.