QFS won't error writing files to a SAN

Hello,
This is probably a simple thing to do but I have not been able to figure out how to do it. We have a SAN up and running QFS with 4 clients connected to it. I have a Java application that is writing files to this SAN and is running on one of the clients. If I unplug the fiber cable that connects that client to the SAN nothing fails. The file continues to grow larger. The Java app continues to run. And actually it's been running for about 3 hours now without failing and the file keeps getting larger. The file can also be seen and seen to grow from the other clients connected to the SAN. This seems pretty miraculous if you ask me!! I understand that QFS is using a caching mechanism by default. Sun told us to try setting the mount to do forcedirectio(I think this is what it is by memory). However they said that if it can't write directly it defaults back to cache anyway.
I can see this behavior being really good for a lot of applications. But, my problem is that I have applications running on all of the clients that are writing very large amounts of data almost continuously to the SAN. If there is any problem writing, whether the SAN just dies or we lose fiber connections or fiber cards or a LUN dies or whatever, I need the applications to be able to failover to an entirely different SAN without a single hickup. The way I thought I'd do this is by catching an I/O exception in the Java application but since QFS never gives an error I can't do this. Is there any way to force QFS to give me an error when there is a problem? Or is there a different way I should go about this. I am relatively new to SAN's so any help is greatly appreciated.

I am following instructions found online
Why not try the os Help menu?
Apple Portables: Troubleshooting the slot load optical disc drive
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