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From: stevem@sauron.Columbia.NCR.COM (Steve McClure)
Newsgroups: comp.sys.amiga
Subject: Supra SCSI on A500
Summary: HD performance low
Keywords: Supra SCSI A500 diskperf ST506
Message-ID: <1668@sauron.Columbia.NCR.COM>
Date: 21 Jun 89 01:44:26 GMT
Reply-To: stevem@sauron.Columbia.NCR.COM (Steve McClure)
Distribution: na
Organization: Tower Uniprocessor Systems, E&M-Columbia, NCR, W Columbia, SC
Lines: 21

Usenetters:
   
   My A500 with Supra SCSI interface, Adaptec 4000A SCSI->ST506 and 
Micropolis 1304 hard disk gives diskperf numbers in the 50K range.
I formatted the disk with SupraFormatII using an interleave of 3.  The disk
is autobooting and the second partition is mounted with Supramount -s.  
judging by other numbers I've seen posted here, these numbers seem to be
extremely low.  The Supra software is version 2.03 (latest?) and I am using
WB1.3 w/KS1.3 rom.  My disk has two 20M FFS partitions.

   I have talked to Supra tech support and was told that the 
Adaptec does not support a "blind SCSI read" meaning that the Adaptec
Tries to verify all data read/written.  The tech rep also said I should see
numbers in the 200K range using an embedded SCSI disk.

   If anyone has a similar setup and experiences, I would appreciate any
direction/help/input.

Thanx in advance,
Signatureless
   - Steve