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From: gibson@b11.ingr.com (Stan Gibson)
Newsgroups: comp.unix.ultrix,comp.periphs.scsi
Subject: Re: ANy joy with 3rd party SCSI disks on DS3100?
Message-ID: <8905@b11.ingr.com>
Date: 3 Oct 90 17:01:42 GMT
References: <1990Sep25.083654.9716@brolga.cc.uq.oz.au> <MNWQ8D2@dri.com> <9750@ccncsu.ColoState.EDU> <270379F7.4803@orion.oac.uci.edu>
Reply-To: gibson@b11.UUCP (Stanley)
Organization: Intergraph Corp. Huntsville, AL
Lines: 11

In article <270379F7.4803@orion.oac.uci.edu> Mike Iglesias <iglesias@draco.acs.uci.edu> writes:
>
>I just check one of our 5000s with a CDC drive on it, and it appears that
>this bit is not in the same place as it is on the Maxtor drives (page 8
>of the drive parameters), so I guess you're out of luck using rzdisk
>on CDC drives.

CDC drives use mode select page 38 ( bit 4 of byte 2)to enable/disable 
read-ahead. This was commonly used among vendors of SCSI-1 drives. The
SCSI-II spec defines the read-ahead page a page 8. The Maxtor drives
support this page. Some of the XT8000's series Maxtors support BOTH pages.