[2454] in linux-scsi channel archive
Re: SCSI ZIP & LILO problem
daemon@ATHENA.MIT.EDU (David Lomas)
Sat Sep 13 13:39:51 1997
Date: Fri, 12 Sep 1997 17:57:32 -0400 (EDT)
From: David Lomas <david@dlomas.com>
To: John Rumball <rumbalj@gov.on.ca>
cc: Keith Owens <kaos@ocs.com.au>, linux-scsi@vger.rutgers.edu
In-Reply-To: <3.0.1.32.19970911104010.006b81e0@govonca2.gov.on.ca>
Generally the LUN and/or SCSI ID number denotes the priority on the
SCSI bus - the higher the number, the higher the priority. Thus, the
slowest SCSI Devices ( in order, usually CDROM, TAPES, SCSI H/D's)
should be given the highest numbers, i.e. CDROM = 6, Tape devices
4 & 5, Hard drives 0,1,2,& 3. The controller itself is usually 7.
Some manufacturers always use the address 6 for their hard-drives so
they will gain that little edge, and the hell with standards.
On Thu, 11 Sep 1997, John Rumball wrote:
> Keith,
>
> At 12:18 AM 12/09/97 +1000, Keith Owens wrote:
> >On Thu, 11 Sep 1997 09:36:46 -0400,
> >John Rumball <rumbalj@gov.on.ca> wrote:
> >> My question is, "How do I fix this so that I can easily add/remove the
> >>ZIP drive from the chain without having these bootup problems?"
> >
> >Fixed drives should have lower SCSI id's than removable drives. That
> >way your fixed drives always come up in the same order, external drives
> >vary from run to run.
>
> Thanks for your comments, but I believe the manual for my AHA-2920
> controller states that if I want to boot off of a fixed SCSI disk, it's id
> MUST be 6. The Zip drive is limited to ids 5 or 6, so I have to use 5.
> Because id's 7, 6, and 5 are taken, the CD-ROM's id can be anywhere between
> 0 and 4 but it's the CD-ROM that I want to leave permanently in place!
>
> Thanks again.
>
>
> John
>
>
> ----------------------------------------------------------------------------
> ----
> John E. Rumball, District Systems Officer
> Ministry of Natural Resources rumbalj@gov.on.ca
> Sudbury,ON Canada
> ----------------------------------------------------------------------------
> ----
>
David Lomas | Good Fast Cheap - pick any two
Lomas Data Management Inc,
Niagara Falls, Ontario
