[luau] improving sustainable write to disk rates

[MonMotha]

Charles Lockhart wrote:
....
> 
> The controller is Compaq's Smart Array Raid controller, and is located 
> on a 32bit pci bus.  The drives are both SCSI, and it looks like the 
> stripe size is 128kB.
> 

What kind of SCSI?

> My test program is writing 4000  4MB files, and I end up with an overall 
> data rate of around 40MBps, which is about half of what I'd been hoping 
> for.
> 

This would be about appropriate on a SCSI2 bus, but a little slow on a 
U160 bus.

> -Charles
> 

--MonMotha