[K12OSN] new server serial ATA or SCSI - results on new 3ware card

[Dan Young]

On Fri, 2004-02-27 at 16:29, Chris Kacoroski wrote:
> I plan to do some more extensive testing next week, but initially it
> looks like it will keep up with a scsi based system.

Can you try something like(*):

	while true
	do
		cat big-file > /dev/null
	done

and simultaneously do:

	cd /usr/src/linux-2.4
	time find . -type f -exec cat '{}' ';' > /dev/null

Supposedly one of the big benefits of SCSI is relatively intelligent
ordering of IO. This ought to provide more graceful degradation of
performance in a heavy multiuser environment w/ lots of simultaneous
competing IO. hdparm just does a single sequential read.

* Pinched from Robert Love's article on IO scheduling in the 2.6 kernel:
http://www.linuxjournal.com/article.php?sid=6931

-Dan Young
-Parkrose School District