On Saturday 03 July 2004 01:28, sigsegv@rambler.ru wrote:
> I've been trying to measure NetBSD software RAID-0 performance on my
> system, with 2 hard disks arranged for striping, however the numbers
> (bandwidth) don't seem to add up, i.e.

There are a number of problems here.  The biggest one is that dd(1)ing from 
the "raw" device does not do any read-ahead.  That is to say, it's completely 
synchronous, and so it may not keep all the subunits busy.