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From: michaelv@iastate.edu (Michael L. VanLoon)
Newsgroups: comp.os.386bsd.misc
Subject: Re: SCASI or IDE disk?
Date: 14 Aug 94 22:43:05 GMT
Organization: Iowa State University, Ames, Iowa
Lines: 32
Message-ID: <michaelv.776904185@ponderous.cc.iastate.edu>
References: <salem.136.2E48D0EF@hauk.hsr.no> <CuJL5C.z7M@yuma.ACNS.ColoState.EDU>
NNTP-Posting-Host: ponderous.cc.iastate.edu
In <CuJL5C.z7M@yuma.ACNS.ColoState.EDU> sandylam@lamar.ColoState.EDU (Sandy Lam) writes:
> well, i currently am getting 15 megs/sec on my IDE controller.
> It's also DMA bus mastering. And the next level of IDE (ATA-3)
> will blow away this one in terms of performance and be 100%
> compatible. It's PCI btw, and relocatable so each IDE controller
> chip handles 4 devices and does not conflict with any others.
This sounds like small bursty performance to me. I'm very skeptical
that you can get large sustained transfers to give this amount of
throughput (even on most SCSI drives).
As a side note, even SCSI-2 wide is capable of 20MB/sec. sustained
throughput. However, there are very few devices that can max out that
bandwidth in one unit. The main intention for such bandwidth is so
that you can have several fast devices (5-10MB/sec.) that don't
totally saturate the bus when being used simultaneously.
> SCSI's got a lot of hype going for it, but don't think IDE is
> going away any time soon.
Nobody said it was. We just said it was the lowest-common-denominator
in PC architecture terms for storage devices. Even EIDE will not be
able to touch SCSI-3 in all-out performance with the best devices
available (they're claiming max throughput of 40MB/sec.).
--
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Michael L. VanLoon Iowa State University Computation Center
michaelv@iastate.edu Project Vincent Systems Staff
Free your mind and your machine -- NetBSD free Un*x for PC/Mac/Amiga/etc.
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