I have a Dell PowerEdge 2900 with a PERC 5/i raid controller running windows 2003 server. Our main accounting program runs on the workstations (windows 2000), but the data is all stored on the Server. Every so often the program exits all by itself and in the event view of the workstation has the following error.

EVENT TYPE: Warning
Event Source: MRxSmb
Event Category: None
Event ID: 50

Description: {Lost Delayed-Write Data} The system was attempting to transfer file data from buffers to \device\lanmanredirector. The write operation failed, and only some of the data may have been written to the file

Data:
0000: 00 00 04 00 02 00 56 00
0008: 00 00 00 00 32 00 04 80
0010: 00 00 00 00 00 00 00 00
0018: 00 00 00 00 00 00 00 00
0020: 00 00 00 00 00 00 00 00
0028: 0c 02 00 c0

I figure this is either a hard drive problem or a network problem. The virtual disk is RAID 5 of 4 Western Digital SATA 10000 RPM 74GB drives. I have set the virtual disk to write through since I don't see an option to turn off write caching all together.

Any ideas?