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From: simon@barnum.enet.dec.com (Curiosier and Curiosier...)
Newsgroups: comp.sys.ibm.pc
Subject: Re: 286 Accelerator and Disk Interleave
Message-ID: <460@ryn.esg.dec.com>
Date: 16 Sep 89 00:34:17 GMT
Sender: guest@ryn.esg.dec.com
Organization: Digital Equipment Corporation
Lines: 33

In article <621@lehi3b15.csee.Lehigh.EDU>, jearly@lehi3b15.csee.Lehigh.EDU (John Early) writes...
>In article <456@ryn.esg.dec.com> simon@barnum.enet.dec.com (Curiosier and Curiosier...) writes:
>>
>>Yesterday I installed a 12 MHz 286 accelerator (Orchid's Tiny Turbo XTra) 
>>into my 8 MHz XT.  The Norton SI went to 10.5 from 1.7, Landmark shows 
>>8.7 MHz.  These tests are recommended by the accelerator manual for 
>[stuff deleted]
>>this time with a disk performance.  It was 0.5 of XT!  Before the accelerator 
>>installation it was 2.
> 
>I had the same problem with my Seagate 251 when I chaged my 8088 to a V20...
>my disk went from 1.8 to 0.6!  I backed up all 3 partitions and re-formatted
>with an interleave of 5 (which made sense, considering the slowdown--I must 
>admit to lacking the software for diagnostics that you do)  The speed returned
>to a 1.8.  I would suggest re-formating the whole drive, unless you want to
>try Spinwrite(commercial), which has worked wonders for friends.


I did all of the above:  backed up all three partitions, reformatted the 
drive with interleave of 5, and got the same result as I got when 
changing interleave without destroyung the date.  With 8088 and 
interleave of 3 I had a factor of 2x XT, with 80286 and interleave of 3 
it was 0.5, with interleave of 5 I got 1.5.  Not the greatest but 
tolerable.

But measuring with SPINTEST shows that the present throughput of 105K 
bit/sec is still well below previous 175K bit/sec with 8088.  Is there a 
way to increase the disk performance?

---
Leo Simon	simon@hpstek.enet.dec.com
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