Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!mips!sgi!shinobu!odin!anchor!olson
From: olson@anchor.esd.sgi.com (Dave Olson)
Newsgroups: comp.unix.questions
Subject: Re: Wren IV cache (was: Re: CDC Wren IV = Seagate 4376N)
Keywords: disk SunOS seagate wren CDC cache
Message-ID: <1991Apr14.220121.10260@odin.corp.sgi.com>
Date: 14 Apr 91 22:01:21 GMT
References: <1913@umvlsi.ecs.umass.edu> <25883@hydra.gatech.EDU> <1991Apr11.164521.18541@searchtech.com>
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Organization: Silicon Graphics, Inc.  Mountain View, CA
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In <1991Apr11.164521.18541@searchtech.com> mra@searchtech.com (Michael Almond) writes:

| In article <25883@hydra.gatech.EDU> ken@dali.gatech.edu (Ken Seefried iii) writes:
| >The Wren IV has a 32K cache on the controller.  The default is for this
| >cache to be off. ... run Roy Neese's SCSICNTL.EXE to turn
| >the cache on.  I don't know of any other way to do this...
| 
| Does anyone know the default for the WREN 6.  We have ours connected to a
| DECsystem 3100 running Ultrix 4.1.  The Installation Manual doesn't mention
| any jumpers to set.

There is no jumper.  It is a bit in mode select page 0x38 (vendor
specific) or page 8 (scsi 2 cache page) depending on which wren VI
drive you have, and/or whether the firmware is a recent revision.

The wren IV is definitely in page 0x38.
--

	Dave Olson

Life would be so much easier if we could just look at the source code.