Browse Prior Art Database

Device Location Codes

IP.com Disclosure Number: IPCOM000119878D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 5 page(s) / 138K

Publishing Venue

IBM

Related People

Benignus, DM: AUTHOR [+3]

Abstract

A method is described which allows location codes to: be determined from software without any input from a person, be determined by a person by looking at the hardware, and work on a family of systems that include a table top model, a floor-standing model, a rack, and external devices attached to the system.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 39% of the total text.

Device Location Codes

      A method is described which allows location codes to: be
determined from software without any input from a person, be
determined by a person by looking at the hardware, and work on a
family of systems that include a table top model, a floor-standing
model, a rack, and external devices attached to the system.

      To repair a system, the Customer Engineer must be told where
the failing part is located.  To run a system, the software must be
told what devices are attached and where they are attached.  Several
schemes have been used in the past.  In some systems all locations
are self- identifying. This is done by special cabling and wiring of
cables and buses.  Assumptions are then made about the packaging and
locations.  On IBM RISC System/6000 machines, cards in slots are
self-identifying while the physical locations of SCSI devices are
not.

      IBM RISC System/6000 is a family of systems that consists of a
rack configuration, a tower configuration, and a table-top
configuration. Expansion boxes, rack drawers, portable files, etc.,
can be attached to the system.  Field Replaceable Units (FRUs) can be
located in any of these units.  To locate a Field Replaceable Unit,
the Customer Engineer needs to know the following information:
    For racks the following are needed:
         rack
         drawer
         slot if an adapter or memory card
         physical location if a device such as a disk or
         diskette location on card if a memory SIMM
    For towers and table-tops the following are needed:
         slot if an adapter or memory card
         physical location if a device such as a disk or
         diskette location on card if a memory SIMM
    For external boxes and devices the following are needed:
         external box or device
         slot if an adapter
         physical location if a device such as a disk or
         diskette

      Software can identify the following location information:
          the system type
          adapter slot
          memory slot
          SCSI address
          the adapter an external device or external box is attached
to

      Software can NOT identify the following location information:
          rack
          drawer
          SCSI device's physical location
          diskette drive's physical location

      The approach for location codes is to use everything that
allows a physical location to be identified and combine that with the
things that can logically be identified. The hardware is then labeled
with these codes.  The scheme is to identify cards in their physical
slots and to identify other resources as follows:
    SCSI Devices are identified by their SCSI address and the slot of
the SCSI Controller.  The physical location of the S...