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Re: tail of two scsis



Check to see if you have a "/usr/local/" directory on
your boot disk (most likely, since you have the root
partition on it). If this is the case, you have a
conflict between the /usr/local directory and the
/usr/local disk (disk B).

Cheers,

Ferdi.

--- jdow <jdow earthlink net> wrote:
> From: "Jose Luis Ricardo Chavez"
> <ricardo irsamc ups-tlse fr>
> > Richard Emberson wrote:
> > 
> > > Jose Luis Ricardo Chavez wrote:
> > >
> > >> Richard Emberson wrote:
> > >>
> > >>> Jose Luis Ricardo Chavez wrote:
> > >>>
> > >>>> Richard Emberson wrote:
> > >>>>
> > >>>>> I've got a FC2 system and a scsi disk with
> /boot and /.
> > >>>>> In addition, I have two other scsi disks
> with /home and /usr/local
> > >>>>> on them (call the disks A and B). Both of
> these disks
> > >>>>> have their IDs set to 6.
> > >>>>> When I boot the system with disk A, disk A
> can be found and
> > >>>>> the boot succeeds. When I replace disk A
> with disk B, disk B
> > >>>>> can not be found and the boot fails.
> > >>>>> Other than the possibility that disk B is
> bad, what else
> > >>>>> could be the cause?
> > >>>>>
> > >>>>> The boot disk is a 7500rpm Quantum.
> > >>>>> Disk A is a 10000rpm Maxtor.
> > >>>>> Disk B is a 7500rpm Quantum.
> > >>>>> Back in my RedHat 9 days, the system used
> both Quantum disks.
> > >>>>>
> > >>>>> Thanks
> > >>>>>
> > >>>>> Richard
> > >>>>>
> > >>>>>
> > >>>> Are both disks using the same SCSI id while
> connected to the same 
> > >>>> cable
> > >>>> (SCSI channel)? As far as I remember there is
> not a "cable select" 
> > >>>> option
> > >>>> when using SCSI disks, both disks should use
> different id's. Put 
> > >>>> the lowest
> > >>>> id on the boot disk (A). If the disks are
> connected to different 
> > >>>> SCSI channels
> > >>>> then maybe there is a problem with one of
> them.
> > >>>> - Jose Luis
> > >>>>
> > >>>>
> > >>> The boot disk is always on the cable. Only one
> of the disks A and B
> > >>> are on the cable at one time.
> > >>>
> > >>>
> > >> Ok, you have three disks, the boot disk is
> permanently connected and 
> > >> you connect
> > >> disk A or B when needed. Is the SCSI BIOS
> detecting disk B?
> > >
> > >
> > > No.
> > > It detects disk A (disk B not connected) but not
> disk B (disk A not 
> > > connected).
> > > The boot disk in both cases is detected.
> > >
> > >>
> > >> - Jose Luis
> > >>
> > >>
> > >
> > >
> > Well, it seems disk B is damaged.
> 
> Or as someone else commented here he is installing
> the B drive at the end
> of the cable and it is not terminated.
> 
> SCSI terminations are critical. You need ONE
> termination at EACH END of
> the SCSI chain. If the chain extends both inside the
> machine and outside
> the machine you still need terminations at the two
> ends of the chain and
> the controller needs to be unterminated. You also
> MUST install drives or
> terminations on the last connectors on the SCSI
> chain, not somewhere in
> the middle.
> 
> {^_^}
> 
> 
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