Browse Prior Art Database

Dynamic Channel Path Addition Process

IP.com Disclosure Number: IPCOM000104564D
Original Publication Date: 1993-May-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Cwiakala, R: AUTHOR [+2]

Abstract

Disclosed is an automatic process for dynamic addition of a channel path (CHP) to an operating system or a set of operating systems running in several logical partitions.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 54% of the total text.

Dynamic Channel Path Addition Process

      Disclosed is an automatic process for dynamic addition of a
channel path (CHP) to an operating system or a set of operating
systems running in several logical partitions.

The automatic process is as follows:

1.  Once a CHP is installed, the operator requests the service
    processor (using the system console) to bring it online to a set
    of logical partitions (specified).  One logical partition (e.g.,
    LP1) is designated to be responsible for updating the I/O
    configuration.
2.  The service processor receives the operator request and presents
    the define/configure CHP request to the designated logical
    partition (LP1).

    The mechanism used to request the function of a logical partition
    is the SCLP (Service Call Logical Processor) events.

    Note that one of the properties of the SCLP event mechanism is
    that the service processor knows which logical partitions are
    capable of performing the required functions.  In the subsequent
    steps, the requests are presented only to those partitions.

3.  LP1 receives the CHP installation order.
4.  LP1 issues an SCLP command to update an IOCDS and a Channel
    Subsystem Call (CHSC) to have the newly installed CHP added to
    the HSA (Hardware System Area) I/O configuration using the
    dynamic reconfiguration management (DRM) function.
5.  The service processor executes the IOCDS update.
6.  LP1 issues...