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Article #1584Re: 5 to 20Mb/s discs for VAX under VMS - suggestions/reviews
From: mangler
Date: Mon, 19 Jan 1987 01:35
Date: Mon, 19 Jan 1987 01:35
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In article <4179@utah-cs.UUCP>, cetron@utah-cs.UUCP (Edward J Cetron) writes:
> WHY???? I recall that the max bandwith of a Qbus is about 4Mbyte/sec
> in block mode DMA, the Unibus is down around 2.2 Mbyte/sec, the massbuss was
> only about 4 Mbyte/sec, and the even the great glorious (-: BI bus is about
> 13 Mbytes/sec and none of dec's controllers are near that fast...
Unibuses and Massbuses are only half that fast.
For that matter, the VAX-750 and VAX-780 memory controllers will only do
about 5 megabytes/second, for all the busses (and the CPU) put together.
Perhaps the original poster meant mega-bits, not mega-bytes?
There are many good SMD disks with transfer rates from 8 to 20
megabits per second.
Don Speck speck@vlsi.caltech.edu {seismo,rutgers,ames}!cit-vax!speck
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!rutgers!ames!cit-vax!mangler From: mangler@cit-vax.UUCP Newsgroups: comp.periphs Subject: Re: 5 to 20Mb/s discs for VAX under VMS - suggestions/reviews Message-ID: <1524@cit-vax.Caltech.Edu> Date: Sun, 18-Jan-87 20:35:01 EST Article-I.D.: cit-vax.1524 Posted: Sun Jan 18 20:35:01 1987 Date-Received: Mon, 19-Jan-87 06:09:14 EST References: <84@gec-rl-hrc.co.uk> <4179@utah-cs.UUCP> Organization: California Institute of Technology Lines: 16 Summary: memory controller bandwidth