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Conference vaxaxp::alphanotes

Title:Alpha Support Conference
Notice:This is a new Alphanotes, please read note 2.2
Moderator:VAXAXP::BERNARDO
Created:Thu Jan 02 1997
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:128
Total number of notes:617

37.0. "SCSI questions" by ILLUSN::SORNSON (Are all your pets called 'Eric'?) Thu Jan 30 1997 14:17

Someone from Xerox (looking into a port of an HP-UX printing
application to Digital UNIX) asked me a few hardware
questions that I don't know the answers to myself.  Thanks
in advance if you can help.  Here they are:

>     4) Hardware
>
>     EnterPrint requires a dedicated SCSI bus for connection to the Xerox
>     printer and to the shared disks.
>
>        Q: Do all hardware platforms support additional SCSI controllers?
>
>        Q: Can the initiator IDs of the additional SCSI controllers be set
>           to 6? (6 is the ID reserved for the print host by the Xerox DDI
>           protocol).
>
>        Q: For each supported platform, can each SCSI controller be identified
>           by a physical slot ID?

E-mail answers are prefered.

-mark.
T.RTitleUserPersonal
Name		DateLines
37.1Usually, Yes, YesXDELTA::HOFFMANSteve, OpenVMS EngineeringThu Jan 30 1997 16:4223
>        Q: Do all hardware platforms support additional SCSI controllers?

   All?  No.  Those with the available I/O bus slots and power, yes.

>        Q: Can the initiator IDs of the additional SCSI controllers be set
>           to 6? (6 is the ID reserved for the print host by the Xerox DDI
>           protocol).

   The SCSI controller ID can be altered -- that the controller SCSI
   ID can be reset is a basic requirement for multi-host SCSI support.
   (Be aware that we generally ship SCSI controllers set to 6, but that
   multi-host SCSI configurations will have hosts at other SCSI IDs.)

>        Q: For each supported platform, can each SCSI controller be identified
>           by a physical slot ID?

   Under OpenVMS, yes -- the controller letters are different for each
   controller installed, so yes, one can identify the controller.  And
   each device on the SCSI maps directly to a particular SCSI ID.
   (Given the requirements for diagnostics, I'd be surprised if UNIX
   did not provide an analogous way to track problems and errors, etc,
   back to a particular controller.)