Subject: Re: Software RAID-0 performance
To: None <firstname.lastname@example.org>
From: Charles M. Hannum <email@example.com>
Date: 07/03/2004 00:34:09
On Saturday 03 July 2004 01:28, firstname.lastname@example.org 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.