Max Filesize for PHP copy

I posted this in the Netware PHP newsgroup, but have not gotten a response. Hopefully I will get something here. I was using a script to copy a file from one location to another. It was working great (but was only testing with small files under 1MB) and then when I tried uploading a file that was a little over 4MB the server abended with the message "Cache memory allocator out of available memory". I looked in the PHP.ini file and changed the max filesize to 5MB and tried to copy the same file. It worked, but I received the same message, but it didn't abend. I don't think that this is normal and would appreciate any suggestions as to a better method or an explanation as to what may be causing this. Netware 6, PHP 4.2.4 (newest version for Netware), Apache 2.0.48 Thanks in advance, Ashley