NetApps can only have 2^16 (65k) hard links per file - which means a directory can only have 65535 subdirectories, which is a big problem for us. We're going to have to rebuild a lot of directories dynamically.
(We have over 4 million users, each with their own little webspace and their own directory on the netapp. We've got one of the home directory subdirs that has just around 200 short of the 65k mark and it's growing rapidly. #$%#$^%#!!!)