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Browse Prior Art Database

Link Incident Reporting Procedures

IP.com Disclosure Number: IPCOM000102624D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Elliott, JC: AUTHOR [+2]

Abstract

Disclosed is a method for I/O control units to report information required for fault isolation. Events which require fault isolation are called link incidents and include conditions such as link failures and high bit-error rate conditions.

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

Link Incident Reporting Procedures

       Disclosed is a method for I/O control units to report
information required for fault isolation.  Events which require fault
isolation are called link incidents and include conditions such as
link failures and high bit-error rate conditions.

      When a control unit detects a link incident condition, data
related to the condition is recorded (the data are collectively
referred to as a link-incident record.)  The link-incident reporting
procedure is used to pass the record to a channel so that it can be
used later for fault isolation.

      A control unit generates a link-incident record for each
link-incident condition that it detects.  If a control unit generates
more records than it has the capacity to store, the most recent
records are kept and the older records are discarded.

      After a control unit has created a link-incident record, it
sends a notification frame to a channel, notifying the channel that a
link-incident record is available to be read.  The channel's normal
response to the notification frame is an acknowledgement frame,
indicating to the control unit that the channel has accepted the
notification and will subsequently read the link-incident record from
the control unit.  If the channel cannot accept the notification and
follow with a request to read the link-incident record, the channel
responds to the notification frame with a busy frame.  The control
unit can then resend the notification frame, possibly to a different
channel.

      After a channel has received a notification frame and sent an
acknowledgement frame in resp...