Date: Tue, 6 Jan 2004 11:56:46 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Mike Maltese <mike@pcmedx.com> Cc: questions@freebsd.org Subject: Re: Poor SCSI disk preformance Message-ID: <20040106175645.GE38169@dan.emsphone.com> In-Reply-To: <012d01c3d47d$40fe8b50$f4f0a8c0@pcmedx.com> References: <000201c3d461$eea71770$0301a8c0@office.cpainc.net> <012d01c3d47d$40fe8b50$f4f0a8c0@pcmedx.com>
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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@allantgroup.com
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