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Browse Prior Art Database

Performing Missing Device Diagnostics for Enclosures

IP.com Disclosure Number: IPCOM000102664D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Benignus, DM: AUTHOR [+3]

Abstract

This article describes a method for diagnosing non-detectable enclosures, which are not explicitly represented in the configuration database of a data processing system.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Performing Missing Device Diagnostics for Enclosures

       This article describes a method for diagnosing
non-detectable enclosures, which are not explicitly represented in
the configuration database of a data processing system.

      An enclosure is a type of device that provides basic services
to other more complicated devices, such as disks and cards.
Enclosures usually contain very little circuitry, but provide
fundamental resources, such as power, fans and I/O buses.  When these
services are not available, all devices that are dependent on them
appear broken.

      System Diagnostics supplements the configuration process by
comparing the past and present configurations to determine why a
device has disappeared.  The missing devices are processed in order
based on their dependencies.  For example, if an expansion box is
broken, then the cards within it will not be detected.

      The user is asked why the device disappeared?  Was the device
removed, moved, or turned off?  If the user indicated that it was
not, then it is assumed that either a device in the path is
defective, the enclosure supporting the missing device is defective,
or the missing device itself is defective.  Diagnostics distinguishes
between these cases, by first testing the path to the missing device,
by performing missing device diagnostics on the enclosure, and
finally by performing missing device diagnostics on the missing
device.  The path can always be tested, because the missing devices
are processed in an order...