External SCSI Disk Array problem

I am using a quad MacPro, 3 GB RAM, 10.4.11, ATTO UL5D SCSI card and an external U320 SCSI disc array. In the last few days I could not copy bigger then 3-6 GB files to the external SCSI storage, from the internal drives or from the an external firewire drive, because the system stalls and I have to restart the system using the power on button.
Any idea what can be the probelm? I checked the SCSI cables, termination, reseated the SCSI card, etcm but the problem remained.

First thing I would do is make sure your data and volumes are fine and run Disk Warrior.
Second, check that you have the latest ATTO drivers and firmware.
Are you using Apple Disk Utility, SoftRAID, or something else?
Can you rule out problem being with FW disconnected, or other PCIe cards?
Last, unrelated, up the memory to 4 x 1GB or more. What Apple recommended for Final Cut, symmetrical memory, or quad-channel,
http://www.barefeats.com/quad09.html
Mac Pro Discussion:
http://discussions.apple.com/category.jspa?categoryID=194
ATTO UL5D
http://www.google.com/search?q=ATTOUL5D+MacPro

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