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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!nntp.coast.net!howland.erols.net!swrinde!sdd.hp.com!col.hp.com!news.corp.hp.com!isonews.bbn.hp.com!news From: Kohler Markus <kohlerm@betze.bbn.hp.com> Newsgroups: comp.os.linux.misc,comp.os.linux.setup,comp.unix.bsd.bsdi.misc,comp.unix.bsd.misc Subject: Re: IDE vs SCSI (was Re: Linux vs BSD) Date: 27 Jan 1997 10:02:05 +0100 Organization: Hewlett Packard GmbH Germany Lines: 45 Message-ID: <tvzpxvpk36.fsf@betze.bbn.hp.com> References: <32DFFEAB.7704@usa.net> <5c8a39$7tn@usenet.srv.cis.pitt.edu> <5c8odp$14q@ravel.cs.colostate.edu> <5c97cd$f6h@cynic.portal.ca> <5cblts$emh@junkie.gnofn.org> NNTP-Posting-Host: betze.bbn.hp.com X-Newsreader: Gnus v5.2.25/XEmacs 19.14 Xref: euryale.cc.adfa.oz.au comp.os.linux.misc:154342 comp.os.linux.setup:93993 comp.unix.bsd.bsdi.misc:5739 comp.unix.bsd.misc:2036 craig@gnofn.org (Craig Johnston) writes: > > In article <5c97cd$f6h@cynic.portal.ca>, > Curt Sampson <cjs@cynic.portal.ca> wrote: > >In article <5c8odp$14q@ravel.cs.colostate.edu>, > >Larry Pyeatt <pyeatt@.cs.colostate.edu> wrote: > > > >>While a modern SCSI system can sustain > 16MB/s and my 5 year old > ^^^^^^ > >>SCSI controller and drives can sustain > 8MB/s > ^^^^^^ > > > >Which SCSI drive do you have that sustains 16 MB/sec, and how did you > >benchmark this? > > I assume he's saying he's "sustaining" (in a totally unrealistic > benchmark) 16MB/sec on his SCSI bus. These "sustained" rates for > big sequential reads are not really the most meaningful metric. > They do give you some idea of what SCSI can do, however. On a real > OS, especially a loaded one, seek latency is prob. more important. > Sustained rates for high-capacity EIDE drives (single) are probably > similar to SCSI drives of the same capacity. (excepting the high-end > 7200RPM stuff -- do they even make EIDE drives this fast? ) > That's the problem. All high end drives i've seen have an SCSI interface. > It's things like tagged queueing and the ability to saturate your bus > with multiple devices that make SCSI a win on real OSes. > > -- > Craig Johnston, SysAdmin (but not speaking for), Greater New Orleans Freenet > > http://www.gnofn.org Free inet access for New Orleans and the Northshore. > http://www.freebsd.org Free 4.4BSD Lite derived OS for 386+ PCs. (just do it) Markus -- +----------------------------------------------------------------------------+ | Markus Kohler Hewlett-Packard GmbH | | Software Engineer Network & System Management Division| | IT/E Success Team | +----------------------------------------------------------------------------+