Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!zephyr!tektronix!tekcrl!tekgvs!keithe
From: keithe@tekgvs.LABS.TEK.COM (Keith Ericson)
Newsgroups: comp.sys.ibm.pc
Subject: Re: scsi rll trade off questions?
Keywords: scsi rll hard disk compatability
Message-ID: <5532@tekgvs.LABS.TEK.COM>
Date: 9 Jul 89 07:16:28 GMT
References: <14978@ut-emx.UUCP> <3299@copper.MDP.TEK.COM>
Reply-To: keithe@tekgvs.LABS.TEK.COM (Keith Ericson)
Organization: Tektronix, Inc., Beaverton,  OR.
Lines: 39

In an earlier article byronl@copper.MDP.TEK.COM (Byron Lunz) writes:
>In article <14978@ut-emx.UUCP> allred@ut-emx.UUCP (Kevin L. Allred) writes:
>>...Segate has recently started marketing a
>>low cost SCSI addaptor (ST01 and ST02) suitable for use with its
>>ST296N 80MB hard disk.  This combination reportedly offeres about 750
>>KB/sec transfer rate, which is comparable to the 1:1 interleve RLL
>>transfer rate, and it is more cost effective.  Apparently the SCSI
>
>I received my new Gateway 2000 386/20 a few days ago.  It arrived with
>a Seagate ST296N and SCSI controller (not sure of the model #).
>Spintest and Coretest 2.7 gave me data transfer rates of 440-460KB/sec!
>
>If someone out there is 
>actually seeing transfer rates around or over 800KB/sec, I'd sure
>like to hear about it.
>
I've evaluated the Adaptec AHA-1540 SCSI controller and the Western
Digital WD7000ASC connected to a 300 Megabyte CDC Wren 4.  With both
cards I got transfer rates slightly in excess of 1 Megabyte per second
in any of our '386 machines (we have Intel 301's (16 MHZ) and step 20's
and 25's (20 and 25 MegaHertz respectively.)

Connecting the Seagate ST-02 to this same drive in an Intel 301 I got
something around 460-480 Kbytes/sec transfer rate.

A WD7000ASC connected to a 150 Megabyte version of the CDC drive in my
'286 box (8 MHZ, I think) yields 818 Kbytes/sec.

In our Step/33 we've got an Adaptec 2332 (2322?) ESDI controller
connected to a Maxtor 380 Megabyte drive (I forget the model number).
It clocks in at just under 1.4 Megabytes per second transfer rate.
(That's right: almost 1.4 megabytes per second.)  This is a 15
Megabit/sec drive/controller pair.  The same controller connected to
another drive (mfgr and model I've forgotten) which is a 10 Megabit/sec
drive yields about 700- to 800-Kbytes/sec transfer rate.

All transfer rates reported with CORE27 and running MS-DOS.

kEITHe