Date: Tue, 2 Apr 1996 00:38:28 -0800 From: Zeki@Dilbert.Oasysinc.com (Zeki Basbuyuk) To: "'Stable'" <stable@Freebsd.org> Subject: RE: SCSI Performance under -stable/-current Message-ID: <01BB2033.F2720440@seyma>
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---------- From: Tom Samplonius[SMTP:tom@uniserve.com] Sent: Saturday, March 30, 1996 8:27 AM To: Marc G. Fournier Cc: stable@freebsd.org Subject: Re: SCSI Performance under -stable/-current The ncr results should be higher, unless your drives are slow. On a=20 -stable system with a 2940 and a Quantum Fireball, I see over 6MB/sec on = file I/O. How do you get this speed? I thought there is a physical limitation on = how much speed you can get for a hard drive. The calculation is as = follows. 120 rps (revs per sec assuming 7200 rpm drive) X 40 sectors per = track (average or above average) X 512 bps (bytes per sector) =3D 2.4 MB = /sec. To get 6 MB either spt needs to increase to 100 or so or rotation = needs to be increased. Tom
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