Article View: comp.sys.super
Article #184Re: I/O subsystems
From: John Mashey
Date: Tue, 12 Jun 1990 03:44
Date: Tue, 12 Jun 1990 03:44
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1628 bytes
In article <6662@amelia.nas.nasa.gov> eugene@wilbur.nas.nasa.gov (Eugene N. Miya) writes:
>In article <39284@mips.mips.COM> mash@mips.COM (John Mashey) writes:
>
>>1) I/O will always be a problem, for all of the usual design reasons,
>
> "When you can give me disks which rotate significantly
> faster than 3600 RPM, then we can start talking."
> --Don Senzig
>
>Time to round up all the "usual" suspects. ;)
Seems like the RPM is only suspect #2. I'd observe that N cheap disks
running in parallel-transfer designs may have N times the "logical"
rotation speed & N times the data xfer rate.... but don't seek in 1/N
of the time of one.... so I'd say that disk seek is suspect #1.
--
-john mashey DISCLAIMER: <generic disclaimer, I speak for me only, etc>
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uwm.edu!zaphod.mps.ohio-state.edu!mips!winchester!mash From: mash@mips.COM (John Mashey) Newsgroups: comp.sys.super Subject: Re: I/O subsystems Message-ID: <39320@mips.mips.COM> Date: 12 Jun 90 03:44:12 GMT References: <201@csinc.UUCP> <253@garth.UUCP> <202@csinc.UUCP> <292@garth.UUCP> <10280@batcomputer.tn.cornell.edu> <359@garth.UUCP> <6374@amelia.nas.nasa.gov> <424@garth.UUCP> <6583@amelia.nas.nasa.gov> <39284@mips.mips.COM> <6662@amelia.nas.nasa.gov> Sender: news@mips.COM Reply-To: mash@mips.COM (John Mashey) Distribution: na Organization: Your Organization Goes Here Lines: 20