Browse Prior Art Database

New Method for Collecting Control-Unit Information from the Active Configuration

IP.com Disclosure Number: IPCOM000104390D
Original Publication Date: 1993-Apr-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Flaxer, D: AUTHOR [+5]

Abstract

Disclosed is a method by which programs can obtain configuration information for all control-units contained in the active I/O configuration.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 82% of the total text.

New Method for Collecting Control-Unit Information from the Active Configuration

      Disclosed is a method by which programs can obtain
configuration information for all control-units contained in the
active I/O configuration.

      Auto-configuration and management programs that are responsible
for the I/O configuration require complete knowledge of all elements
which comprise the logically defined and physically installed I.O
configuration.

      Active I/O configuration information (that is, the
configuration that is known to the Channel Subsystem) is available to
programs by established programming interface methods.  Existing
methods for obtaining control-unit, making the detection of
deviceless control-units that are known to the channel subsystem
impossible.  This effectively prevents programs from constructing a
complete picture of the active I/O configuration.  Control units
without devices can occur when the I/O configuration is filtered by
hypervisor control.

      Existing programming interface methods are enhanced to provide
information on all control-units contained in the active I/O
configuration through the use of their control-unit number, as
opposed to the reference of an associated device (subchannel).

      The figure illustrates the problem and this solution.  Included
in the active I/O configuration are: four CHPIDs, four control-units
and four devices (subchannels).  Two channels and control-units are
attached to a dynam...