Poor SCSI disk preformance

[Dan Nelson]

In the last episode (Jan 06), Mike Maltese said:
> > 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.

It should go faster than 5MB/sec, though.  Seagate's specs say that
drive should do 14MB/sec max.  UW's top speed is 40MB/sec, so there
shouldn't be any bottlenecks.  

-- 
	Dan Nelson
	dnelson at allantgroup.com