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From: stevem@sauron.Columbia.NCR.COM (Steve McClure)
Newsgroups: comp.sys.amiga
Subject: Re: Hard Drive On 1000 Interleave problems
Message-ID: <1796@sauron.Columbia.NCR.COM>
Date: 7 Nov 89 13:11:18 GMT
References: <4842@udccvax1.acs.udel.EDU: <1667@agora.UUCP>
Reply-To: stevem@sauron.UUCP (Steve McClure)
Distribution: usa
Organization: E&M-Columbia, NCR Corp, W Columbia, SC
Lines: 27

In article <1667@agora.UUCP> billsey@agora.UUCP (Bill Seymour) writes:
>From article <4842@udccvax1.acs.udel.EDU:, by mentor@vax1.acs.udel.EDU (Rodney K Rickenbach):
>: I have a 1000 w/ a Supra SCSI interface going to a 72 meg Priam drive (MFM)
>: using an Adaptec controller.  Anyway, the Supra-format util. didn't have

>: I kinda guestimated, and well, using diskperf I have found a throughput of
>: around 45K/sec.  Is there any easy way to find the optimum interleave (ie

>give you a good approximation of the speed with a quick format. You should
>be able to see speeds of about 150-200K/sec with your system. The Adaptec
>4000a doesn't go too much faster than that. Also turn on the 'blind reads'
>from the SupraEdit utility. Your drive is fast enough to keep ahead of the
>Adaptec and you'll see a significant improvement in speed.

I have a Supra SCSI controller on my A500.  I used Adaptec 4000a->40M ST506
drive.  It was a Micropolis w/28ms ave access time.  With blind reads turned
on, interleave of 3, I never got better than 55K/sec transfers.  I now have
a SCSI disk and get 210K transfers.  I talked to Supra about the slow speed
and they said "The adaptec is slow, get a SCSI disk."  My controller is about
6 months old and I have the Series II V1.09 software.

Good Luck,
Steve
-----
stevem@Columbia.NCR.COM
The above are my opinions, which NCR doesn't really care about anyway!
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