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From: craig@gnofn.org (Craig Johnston)
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: 24 Jan 1997 18:59:40 -0600
Organization: Greater New Orleans Freenet
Lines: 30
Message-ID: <5cblts$emh@junkie.gnofn.org>
References: <32DFFEAB.7704@usa.net> <5c8a39$7tn@usenet.srv.cis.pitt.edu> <5c8odp$14q@ravel.cs.colostate.edu> <5c97cd$f6h@cynic.portal.ca>
NNTP-Posting-Host: junkie.gnofn.org
Xref: euryale.cc.adfa.oz.au comp.os.linux.misc:154080 comp.os.linux.setup:93793 comp.unix.bsd.bsdi.misc:5725 comp.unix.bsd.misc:2018
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? )
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)