From: Paul Woods (
Date: Sat Jul 22 1995 - 05:47:59 CDT

I received amny responses, but most said that it was not possible. This does not
however seem to be the case. It is very possible to change the scsi id's of the
drives located in the internal drive bays of a SS20 bays. The best answer came

Bill Holzapfel
dc Value Added Service Technologies Downers Grove, IL.

Who sent me a summary that was originally sent out by: (Brett
Lymn) and then Brett sent me a response himself saying that it is possible. The
answer is below.

Btw, I received a very interesting response from Henry Katz that is probably
the approach that I will use just because it's the most creative response that I
have received. The response from Henry will follow the response from Bill/Brett

Thanks to all,


 I think this should help. It's a summary I kept that
indicates you can "add" to the target number with the
jumpers on the drive. I've never tried it thou.

Bill Holzapfel
Technical Support (708) 964-6060 ph.
dcVAST Inc. (708) 964-6069 fax
dc Value Added Service Technologies Downers Grove Il.

> From Thu Jun 8 14:13 CDT 1995
> Sender:
> From: (Brett Lymn)
> Subject: SUMMARY: Anyone got the jumper info for a Seagate ST31200WC?
> To: (Sun Managers Mailing List)
> Date: Wed, 7 Jun 1995 20:15:15 +0930 (CST)
> Mime-Version: 1.0
>> A day or so ago I sent out this message:
> >
> > I have a SS20 that came with a Seagate ST31200WC 1Gig drive
> >internally. Due to various circumstances the drive got removed and
> >external ones used instead. Now we want to install the ST31200WC back
> >into the machine but find that the SCSI ID's on both the snazzy
> >internal connectors clash with the two external drives (id's 1 and 3).
> >Anyone know how I can change the ID of the internal drive to something
> >else? I have tried trawling Seagate's WWW page ( but
> >the graphic of the drive I am looking for is not available :-(
> >
> >The drive is a Seagate ST31200WC (If you hadn't caught that by now ;-)
> >with one of those integrated drive connector thingys on it (i.e.
> >power, data, so on come in on the one connector).
> >
> Firstly thanks to all the people that took the time to respond - there
> were a lot of you!
> A lot of people told me flat out that I could not do it and that I
> should just change the external drives. Me being the curmudgeon I am
> did not want to do this as it involved fixing the dfstab and then
> opening up the drive case and jiggering jumpers.
> The short answer is that it _is_ possible. The jumpers at the front
> of the disk are "wire-or'ed" with the ones on the drive connector.
> That is, the resulting ID will be the combination of what is shorted
> on both front and back connectors - I now have my disk running as id 5
> by shorting the 4 bit on the front connector and putting the disk into
> the top drive bay (normally drive 1). Since this is a Solaris 2
> machine the id will work ok.
> Jim White ( sent me a copy of the data from
> the Seagate BB which seems to be _wrong_ (sorry Jim, I appreciated the
> data but I thought I would warn people!) - they claim that the front
> connector overrides the 80-way connector id (it does not) AND the
> picture they gave for the connector seems to be incorrect, at least
> the way I got it to work did not match what was in the diagram that
> Jim sent me.
> I cannot exactly remember which pins are for what ID but it seems that
> on the disk I have that the ID pins are on the left hand side of the
> front connector if you hold the disk facing you with the HDA
> uppermost.

the internal SCSI address are autoconfigurable - which means you shouldn't
change them, change SCSI pin jumpers, etc.. Of course if you want to
change them you can take advantage of the knowledge that the drvconfig
devlinks and other utilities that are invoked upon reboot reconfig simply
assign the next available scsi target when they create the /dev/dsk/c0tNdxsy
device node. So if you fill this slot and then do a live reconfig without
rebooting you should be able to specify the next target.
Why are you doing this, though?


Henry Katz, M.S. | Email:
ISCS, Inc. | currently on contract at:
(718) 263.5762 |
Sigma Imaging, Inc | Phone: (212) 476-6464
622 Third Ave 5th floor | Fax: (212) 476-6915
New York, NY 10016 | Pager: (917) 899-1420

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