Poor SCSI disk preformance

Mike Maltese mike at pcmedx.com
Tue Jan 6 09:48:01 PST 2004

> I also had (meaning it is not currently attached) a different
> SCSI drive attached on the bus, with the same results.  Has
> anyone any tips for this from a FreeBSD point of view?

I wouldn't say that dd is the greatest benchmarking tool. You may want to
try benchmarks/rawio. Also, try monitoring diffferent types of transfers to
and from another physical disk with iostat. I'm not sure what your speed
expectations are, but you're running a 7200 RPM Ultra Wide disk on an Ultra
Wide host adapter; not exactly the fastest SCSI technology.

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