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From: kad@ttrdc.UUCP (Keith Drescher)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Interleave factor on a 6300
Message-ID: <1844@ttrdc.UUCP>
Date: Thu, 6-Aug-87 14:35:28 EDT
Article-I.D.: ttrdc.1844
Posted: Thu Aug  6 14:35:28 1987
Date-Received: Sat, 8-Aug-87 14:40:11 EDT
References: <2928@mtgzz.UUCP>
Reply-To: kad@ttrdc.UUCP (Keith Drescher)
Organization: AT&T Computer Systems Division,  Skokie, Ill.
Lines: 32

In article <2928@mtgzz.UUCP> rosen@mtgzz.UUCP (t.rosenfeld) writes:
>There has been some talk recently in this newsgroup about interleave
>factors. Someone said a factor of 1:4 is recomended for the 6300, and is
>much faster than 1:3 which may be some default.
>
>My question is how can I tell what my current factor is? I have Norton
>Utilities,  will that help. I suppose I may also want to know how to change it
>if I have to. I suppose this requires a low level format, but I'll worry about
>that if and when I find out my factor is wrong.
I found that I had the wrong interleave factor
on my pc6300 by running the Norton SI program.
I got a hard disk performance ratio relative to the
XT of 0.5, which was unreasonable.  I was using
a WD controller and a 10M hard disk.
I kept low level formating (which allows choosing an interleave factor),
running fdisk, and running the api format.  Then running Norton's SI until
I got 1.0 performance ration to the XT.  At any rate, run SI, if your
performance is < 1.0, your interleave is probably wrong (unless you've got a 
really slow hard disk/controller combination). 0.5 is definately wrong.
Keep trying interleave factors until you get >=1.  The reasonable values
for most 10 and 20 Meg disks (that I've seen) are 3, 4, 5, 6.  
>
>Oh, by the way. Is 1:4 also recomended for the PLUS? Do I use the same
>technique on the PLUS to find out what it is?
>
>

-- 
Keith Drescher (kad@ttrdc)          	   | ... You can check out any      
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