> Nov  4 10:36:31 terra kernel: sd 5:0:0:1: SCSI error: return code = 0x000b0000
> Nov  4 10:36:31 terra kernel: end_request: I/O error, dev sdq, sector 5858973568
> Nov  4 10:36:31 terra kernel: printk: 16 messages suppressed.
> Nov  4 10:36:31 terra kernel: Buffer I/O error on device sdq, logical block 732371696
> Nov  4 10:36:31 terra kernel: sd 5:0:0:1: SCSI error: return code = 0x000b0000
> Nov  4 10:36:31 terra kernel: end_request: I/O error, dev sdq, sector 5858973568
> Nov  4 10:36:31 terra kernel: Buffer I/O error on device sdq, logical block 732371696
> Nov  4 10:36:32 terra kernel: sd 5:0:0:1: SCSI error: return code = 0x000b0000
> Nov  4 10:36:32 terra kernel: end_request: I/O error, dev sdq, sector 5858973688
> ...
> Nov  4 10:36:33 terra kernel: sd 5:0:0:1: SCSI error: return code = 0x000b0000
> Nov  4 10:36:33 terra kernel: end_request: I/O error, dev sdq, sector 5858973688
> Nov  4 10:36:33 terra kernel: sd 5:0:0:1: SCSI error: return code = 0x000b0000
> Nov  4 10:36:33 terra kernel: end_request: I/O error, dev sdq, sector 5858973688
> Nov  4 10:36:33 terra kernel: sd 5:0:0:1: SCSI error: return code = 0x000b0000
> Nov  4 10:36:33 terra kernel: end_request: I/O error, dev sdq, sector 5858973568

It's looking horribly like a disk error: have you checked it?
Try badblocks.

John