[SunHELP] One tape unit for 2 machine.

[Phil Stracchino]

On Wed, Feb 11, 2004 at 03:35:01PM -0200, Joaquim Humberto Marques Mota wrote:
> Hi
> 
> We have one external tape unit (DDS4) with two scsi interaces (In/Out).
> 
> I4d like to share this unit between 2 machines (SF 280R e E3500). Each
> one connected on SCSI interface of tape unit.
> 
> How to modify a SCSI ID of port in a Sun Fire 280R to avoid problems
> with host signalling?

Uh, wait a minute, you want to connect a single SCSI device to two host
controllers in two different machines?!?

Be afraid.  Be very afraid.  That tape drive, contrary to your belief,
does NOT has two SCSI interfaces.  It has one interface.  There just
happen to be two ports on that one interfact, two connectors which are
*directly connected* electrically to each other and the drive's
controller, to permit daisychaining.  If you try to connect this to two
different SCSI controllers simultaneously, the results will be very bad.
Devices do exist which are designed to be connected to multiple hosts at
once; your DDS4 drive is not one of them.


Install software that will share the drive's services.  Do not try to
physically share the drive.


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