Can't write to one array - error -50

I have an XServe RAID with a 7 disk 3TB RAID 5 volume on one side and a 4 disk 1.2TB RAID 5 volume on the other side. I am suddenly no longer able to write to the 3TB volume. The smaller volume works fine. The same error (-50) occurs from a client trying to access their files via AFP as well as directly in the finder on the server. Any ideas as to what might cause this and how to go about fixing it?
Disk util etc. don't show any errors.
Thanks,
Miles
XServe G4 dual 1.33, 2GB RAM, Apple Fibre card and cables (optical, I think).

Hey Miles,
I've found errors to pop up when a drive or a controller starts to go sour... naturally, controllers failing is almost underheard of (but it does happen) so always best to make sure its a drive acting funny first. Of course if the drive isnt yellow or red, apple wont really help you.. here's a way to see if a drive is the case and if so, how to speed up the process to make it trigger yellow or red:
Go to Raid Admin
Go to the drive conditioning option ( i believe this is raid admin 1.5 only)
start conditioning on the array in question and let it go...
You should see all the drives go blue.
First way to check is to see if any errors start popping up in raid admin (and apple would help you from there)
Second way to check is to see if one of the drive's blue LEDs is acting funny (stays solid all the time, blinks out of sequence with the other drives, etc)
If those happen, chances are that drive's gonna go soon and either a colored light or an error is more than enough for applecare to replace it if you have warentee/applecare.

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