Any advatnges or disadvantages of setting the SCSI id's on the devices as they
progress along the cable?
That is, first device from controller - SCSI ID 0 (The cd-rom, first
connector)
Second device - SCSI ID 1 ( the first drive, second connector)
Third Device - SCSIS ID 2 (the second drive, third connector)
etc.
Or can I just place them anywhere along the cable?
I tend to think that it is easier to keep track of things by placing them in
order...
regards and thanks,
your answer has cleared things up a lot.
Ahbaid.
"Mikkel L. Ellertson" wrote:
> On Sun, 3 Sep 2000, Ahbaid Gaffoor wrote:
>
> > Hi all,
> >
> > I'm almost doen building my linux - oracle database server...
> >
> > Just one question for the SCSI experts.
> >
> > The board is a supermicro P6DBS with an onboard adaptec SCSI controller.
> >
> > I have four seagate ST12550N 50 pin SCSI drives, and the board has a 50
> > pin interface. I also have a 50 pin SCSI cd-rom and a 50 pin cable that
> > can handle seven devices.
> >
> > Here's the plan:
> >
> > Let's say the cable is numbered from the motherboard connector to the
> > last device on it as 0 through 7.
> >
> > I plan to put the cd-rom on 1, the four drives on 2 through 5, leaving 6
> > and 7 unattached.
> >
> > Do I need to get a SCSI terminator? If so, do I put it on 6? Or, if the
> > drive on 5 can be made to terminate, is that what I should do?
> >
> > Your advice is all welcome.
> >
> > thanks,
> >
> > Ahbaid.
> >
> With SCSI, both ends of the chain nead to be terminated. What you can
> do with the setup you have is to turn on the termination on the drive on
> connector #5. The mother board should have termination turned on for
> its end, especialy if it only has the one SCSI connector. Just make
> sure that only the drive farthest from the motherboard is the only one
> that has termination turned on.
>
> Things to keep in mind - each drive needs to be jumpered to a seperate
> ID, and the controller is usualy numbered 7. Also, if you are planning
> to boot off of a SCSI hard drive, you may be limmited to ID 0 and 1 for
> booting. This is a common BIOS limit.
>
> Mikkel
> --
>
> Do not meddle in the affairs of dragons,
> for you are crunchy and taste good with ketchup.
>
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