New Server, much slower on AFP, SMB just fine

Hi,

hope you can steer me in the right direction. We went from a Xserve G4 to an Xserve Xeon. Attached to that Xserve Xeon is a brand new Xsan. Transfer and browsing for files speed is way down compared to the old server. It seems to be limited to AFP and only if more then 1 or 2 people are logged in. We have tried 10.4.10 and 11 and 10.5.1 but speed remained low. SMB, FTP speed is fine. It seems limited to AFP. We raised the afp:maxthreads but that hasn’t helped either. No home directories, just Illustrator etc files. Copying to the internal disk is just as slow as to the Xsan so that doesn’t look to be the problem.

Connected to Active Directory 4GB ram dual processor Gigabit networking HP Procurve 2824.