[4991] in linux-scsi channel archive
Re: Howto: rescan scsi bus after a hot swap ??
daemon@ATHENA.MIT.EDU (Michael Schwingen)
Sat Oct 24 16:48:42 1998
Date: Sat, 24 Oct 1998 22:10:24 +0200
From: Michael Schwingen <michaels@stochastik.rwth-aachen.de>
To: Drew Eckhardt <drew@poohsticks.org>
Cc: Marty Leisner <leisner@sdsp.mc.xerox.com>,
Chris Atenasio <chrisa@ultranet.com>,
Hardware Stuff <mrfixit@clouddancer.com>, linux-scsi@vger.rutgers.edu,
ncr53c810@Colorado.EDU
In-Reply-To: <199810232033.OAA11507@chopper.poohsticks.org>; from Drew Eckhardt on Fri, Oct 23, 1998 at 02:33:01PM -0600
On Fri, Oct 23, 1998 at 02:33:01PM -0600, Drew Eckhardt wrote:
> The standard doesn't restrict bus interaction for powered off devices,
> and some result in munged data when powered down (I think my old
> DEC RZ55 did this).
Hm. IIRC, the standard *does* specify that a powered-off device shall not
disturb bus operation - so I always thought that these few (and old) devices
which do (Segate ST296N is another one) simply are not standard-compliant.
I and some friends have been using hot-plugging quite extensively using
those disk bays with a 50-pin centronics plug. It is definitely not
standard-compliant, since the connector does not guarantee that you make the
ground connectio first and break it last, but it works just fine (your
mileage may vary).
Of cource, when hot-plugging, it is important not to break the bus at any
time, since that would disturb termination.
cu
Michael
--
In the beginning there was nothing, which exploded.
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