Weird SCSI error, can anyone interpret?

["Kevin P. Fleming" <kpfleming@backtobasicsmgmt.com>]

I've got a client with a server running 2.6.3-rc2, using a QLogic 
ISP2100 connected to a CMD FC-to-SCSI RAID controller. On Saturday 
morning, the system lost access to the RAID array, with thousands of 
messages like these in the log:

Feb 28 03:15:46 alpha kernel: SCSI error : <2 0 0 0> return code = 0x20000
Feb 28 03:15:46 alpha kernel: end_request: I/O error, dev sdc, sector 
278362544
Feb 28 03:15:51 alpha kernel: SCSI error : <2 0 0 0> return code = 0x20000
Feb 28 03:15:51 alpha kernel: end_request: I/O error, dev sdc, sector 
304356160
Feb 28 03:16:06 alpha kernel: SCSI error : <2 0 0 0> return code = 0x20000
Feb 28 03:16:06 alpha kernel: end_request: I/O error, dev sdc, sector 
360710592
Feb 28 03:16:06 alpha kernel: SCSI error : <2 0 0 0> return code = 0x20000
Feb 28 03:16:06 alpha kernel: end_request: I/O error, dev sdc, sector 
327384736

There are also some with "return code = 0x20008".

Restarting the Linux system did not help; power cycling the RAID array 
did help. I'd like to get some clue as to whether this points to a 
problem with the RAID controller, the FC host adapter, or the kernel's 
QLogic driver. This system had been previously using the QLogic driver 
from SourceForge for months on a 2.6.0-pre(something) kernel, but 
recently got upgraded once the QLogic driver was merged into the main 
kernel distribution.

Please CC me on any replies, I'm not subscribed to linux-scsi. Thanks!