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- From: turbo@cse.uta.edu (Chris Turbeville)
- Subject: Re: Question about ISA/IDE disk throughput (pc newbie)
- Message-ID: <1992Dec21.220009.12403@utagraph.uta.edu>
- Followup-To: Question about ISA/IDE disk throughput (pc newbie)
- Summary: Get a better bus
- Keywords: speed bus IDE EISA ISA SCSI VESA
- Sender: turbo@cse.uta.edu
- Nntp-Posting-Host: cse.uta.edu
- Organization: Computer Science Engineering at the University of Texas at Arlington
- References: <MUTS.92Dec21193512@PMCS.estec.esa.nl>
- Distribution: comp
- Date: Mon, 21 Dec 1992 22:00:09 GMT
- Lines: 38
-
- In article <MUTS.92Dec21193512@PMCS.estec.esa.nl> muts@estec.esa.nl (Peter Mutsaers) writes:
- >Sorry if you see this message twice. I posted before but the article
- >didn't seem to show up.
- I didn't see it twice.
- >
- >In a magazine I read for a couple of 386sx PC's that disk access (IDE)
- >is only at 200 kbyte/s. This seems terribly slow to me, especially
- >for an OS like unix. Is this really true? Do 486dx's have much better
- >IO speeds? How can UNIX live with such a low bandwidth. Are local
- >busses much faster (how much)?
- 200kB/s sounds about right for IDE (save the newer caching controllers)
- and it is terribly slow. 486dx's make no improvement on disk transfer
- speed. It is your 16bit 8Mhz ISA bus which is limiting it. I don't
- think full blown vmunix would live well in such an environment. Local
- busses are faster and so is EISA but here is my quandry. I want top
- transfer speed from a SCSI-2 FAST (is WIDE very available?) disk which
- according to things I have read is 10MB/s (They put a big b as in
- mega-bytes per sec can anyone confirm this for SCSI-2 FAST?). Now
- EISA's top transfer speed is well beyond that so technically EISA should
- be fast enough right? So is this the upper limit? Or can we with a
- caching (I know don't waste money on a caching controler till you have
- >64meg on your motherboard but for the sake of argument) SCSI-2 FAST
- controller with a VESA bus and move to the specified 110MB/s VESA LB is
- supposed to have? Or is it really that no hard drive can move faster
- than even the EISA bus but graphics plus hard drive can outstrip EISA
- requireing the new VESA standard? Any techies out there have some
- semi-hard (I know no numbers are really reliable) numbers on
- ISA/EISA/VESA? What I want to know is what is the fastest bus/HD
- combination? How will it work with a 32bit graphics card? I am just
- stumped as to which board to buy and I just keep putting it off to see
- the results of these hardware battles. (Sorry Peter to answer your
- questions with questions but I am stuck in this and your questions "got
- me going" on it.)
- -Chris
- Thanks
- -Chris
-
-
-