[luau] improving sustainable write to disk rates

[MonMotha]

Warren Togami wrote:
....
> 
> I think modern SCSI drives (and even IDE drives) can sustain 40MB/sec
> sequential with only a single disk.  What kind of speeds do you get with
> a single disk on that SCSI controller?
> 
....

Modern SCSI drives can, and modern SCSI busses can handle multiple 
drives all maxxed.  Unfortunately, he says his RAID controller has some 
odd issue that's forcing it to SCSI 2 (Ultra SCSI, didn't specify wide 
or fast, but I assume one of them as Ultra SCSI 2 is only 20MB/sec). 
40MB/sec is hitting the max transfer rate of the bus.  He needs to 
convince it to actually use the Ultra SCSI 3 (U160) modes that it's 
supposed to support.

--MonMotha