The Plague of the Disconnecting Xsan

I am living in Xsan H.e.l.l. I pray someone can save me from this torture.
Anyways, here is the situation:
I've been working on trying to make an xsan work for over 6 months now. The latest problem is I am getting constant disconnects when accessing large amounts of small files on the xsan. This is reproducable consistently. I get an error that says "Server connection interrupted: volumename". My only option is to "Disconnect".
I have three Xservers running 10.4.6. I have one brand new Xraid box. I'm running Xsan 1.2.
I have one client xserver
and two controller xservers, with one high priority and one medium priority.
I've done the following:
(1) Tried the manual configuration mentioned on Apple's web site article number 302135
This resulted in the qlogic switch placing all of my xserves as "targets" when they are actually initiators. An it makes my xraid box be "Unknown". This doesn't help stop the disconnects. So I put it back on Auto I/O stream and Auto Device scan and the devices are properly labelled as initiators and targets.
(2) I called up Qlogic and talked to them, they said that this problem normally happens with lots of small files. Their answer to the problem was to go into the Apple Fibre Utility on all of the systems and change the settings so that the Fibre ports run at 1gb/s and it is set up as point-to-point. Which I did. No effect.
(3) I had a gigabit layer 3 switch that I had been using for the private network for the Xsan's meta data. At an apple tech's suggestion, I installed a 10/100 hub instead, but this doesn't affect the disconnects either.
I'm at a loss and my boss is coming back on monday and I still have a unusuable Xsan. Can anyone help me?
I've talked to Apple Enterprise Techs, but they like to just blaim this on the Qlogic switch without ever trying to understand what is going on.
Thank you
David
  Mac OS X (10.4.6)  
  Mac OS X (10.4.6)  

I'm having the same problem, only I'm mounting a Sun system running solaris. I simply try to do an ls on a directory containing perhaps a hundred or two text files and it just hangs. I can't control-c the process and am forced to control-z/kill -9. I then start seeing nfs errors like this:
nfs server dyeset:/users: not responding
nfs server dyeset:/users: not responding
nfs server dyeset:/users: not responding
nfs server dyeset:/users: not responding
nfs server dyeset:/users: not responding
nfs server dyeset:/users: not responding
Smaller directories work just fine and I don't get the errors until I try to do something in a large directory. Then I eventually get the window the original poster described "Server connection interrupted: volume-name" and disconnect is the only option. I can re-establish the mount with:
sudo kill -HUP `cat /var/run/automount.pid`
but I consistently cannot do anything in large directories. I was looking at the man page for mount_nfs. Perhaps the -r option would alleviate the problem? The only option I have set in niutil for the mount is "-P". I've used similar mounts in the past without -P on 10.3.9 and never had this problem. That was a sun/solaris system as well, albeit a different system.
Any suggestions?
Thanks,
Rob
G4   Mac OS X (10.4.6)  

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