From owner-freebsd-scsi  Sun Mar  9 15:40:39 1997
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To: Keith Mitchell <kmitch@weenix.guru.org>
cc: scsi@freebsd.org
Subject: Re: Micropolis 4221W and 20MB/s SYNC 
In-reply-to: Your message of "Sun, 09 Mar 1997 09:29:07 EST."
             <199703091429.JAA00689@weenix.guru.org> 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Sun, 09 Mar 1997 15:41:12 -0800
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>For some reason my Micropolis 4221W (wide scsi) drive is only getting 
>10 MB/s sync rate instead of the 20 it is supposed to get (according to
>the drive spec).  The drive is hanging off an Adaptec 3940UW controller.
>
>The sync rate in the setup is set to 20 and ultra is disabled (enabling it
>doesn't do anything).

   Ultra mode has to be enabled in SCSI-select in order to use Ultra speeds.
The problem is that the Micropolis 4221 isn't an Ultra-SCSI drive. The
product literature clearly says "fast/wide" which means 10MHz, 16bits...or
in other words, 20MBytes/sec.

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project