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Browse Prior Art Database

Double Thresholding of Errors

IP.com Disclosure Number: IPCOM000100165D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 1 page(s) / 40K

Publishing Venue

IBM

Related People

Garofalo, FJ, JR: AUTHOR [+2]

Abstract

Disclosed is a method which provides the ability to distinguish the severity of a failure so that the correct error recovery action can be performed.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 79% of the total text.

Double Thresholding of Errors

       Disclosed is a method which provides the ability to
distinguish the severity of a failure so that the correct error
recovery action can be performed.

      When an error is detected it must be determined if the error is
due to a real failure or because of an extraneous "glitch".  Many
times the differences between these two are subtle, and the decision
is based on how often the error occurs.  This is called thresholding
the error and may be based on errors per a given time period, or
errors per successful operation.

      When the threshold value is exceeded, the error is considered a
failure and the appropriate action taken.  Many factors are
considered when determining a threshold value, including the effects
of the error and the probability that it is extraneous.  If an area
of the machine were critical, a high threshold would be set. However,
if set too high, the entire box may be disrupted due to the handling
of a large number of errors.

      The solution is to have two different threshold values for the
same error.  One threshold is based on a long time period, such as
hours.  If this threshold is exceeded, the error is reported as a
failure but the hardware is allowed to continue functioning.  A
second threshold is based on milliseconds; if this is exceeded, the
error is reported and hardware is shut down.

      If there were only one threshold, the value chosen would have
to be a compromise.  Eit...