On Tue, 3 Jul 2001, gabriel rosenkoetter wrote:

> On Tue, Jul 03, 2001 at 08:42:23AM +0200, Juergen Tritthardt wrote:
> > Externally connected is an CDWR which is switched off, but I think with
> > passive termination. Could that be the reason?
>=20
> Well, the urban rumor-style wisdom is that having a SCSI device
> connected but not switched on is kind of a bad idea, but that's
> largely because you may be tempted to turn it on (which may be okay
> or may completely confuse the SCSI bus depending on how noisy the
> device is on startup).
>=20
> In general, passive termination isn't good enough for any modern
> SCSI bus, so that *could* be the problem, but it's not likely.
>=20
> This sounds like a problem with your internal SCSI bus (which is
> separate from the external on that machine, no?). Are you sure that
> BOTH ends of the bus are terminated? That there are no unterminated
> stubs?

I was sure, but I checked it today. The disk were fine (termination on the
one on the end of the cable), but the CDROM was also terminated (if the
termination is active when the jumper is placed)! I couldn't believe it,
really. So I pull the jumper on the CDROM plupped in the external
switched off SCSI device and now I'm waiting if this is happening again.


=09Thanks
=09J=FCrgen
--=20
J=FCrgen Tritthardt              Max-Planck-Institut f=FCr med. Forschung
Tel. 06221/486279                          Abt. Biomedizinische Optik
Fax. 06221/486225                       Jahnstr. 29, 69120 Heidelberg