I created a question/topic about this in the php forums but was told to go here since it might be a problem with ftp.
My upload script worked well in the begining but started to make problems when the load/uploads increased - i'm currently getting average 1800 uploads per day (increasing fast). It dosent post any errors, just fail (blank page). Have searched the logs but havent been able to find anything related to this issue.
Started with phpftp and switched to CURL since this should be able to handle a higher load (was told), but keep getting 0 byte uploads upon bigger files (above 1 MB) sometimes it goes okay (correct filesize) but most times it's just 0 byte. Changed it so it upload to the main server instead of the fileserver, waiting on the results of this test.
It works this way:
A user upload a file (up to 60MB) using a standard upload forum, after upload (which always goes okay) the file is FTP'ed to the correct fileserver.