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Channel-to-channel connection system for acknowledging reinitialization and its method

A technology of re-initialization and initialization, applied in the field of channel subsystem, which can solve problems such as misjudgment and device isolation

Inactive Publication Date: 2004-05-12
INT BUSINESS MASCH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of this change in the relevant subsystem, the TNED in the traditional CDR used to describe the device does not match, thus causing the general verification process to misjudge an invalid CTC connection, resulting in the device being quarantined

Method used

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  • Channel-to-channel connection system for acknowledging reinitialization and its method
  • Channel-to-channel connection system for acknowledging reinitialization and its method
  • Channel-to-channel connection system for acknowledging reinitialization and its method

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Embodiment Construction

[0023] As briefly stated above, the present invention generally relates to identifying channel-to-channel (CTC) connections between two channels within a computing environment, where either channel may provide CTC control unit (CU) functionality. The acknowledgment techniques disclosed herein can avoid false indications of configuration errors when the CTC Control Unit (CU) function switches from one end of the CTC connection to the other after the CTC connection is re-initialized.

[0024]This validation technique can be applied, for example, to a computing environment based on one or more zSeries 900 computers offered by IBM Corporation (Armonk, New York). CTC connections in the context of the zSeries 900 are described in IBM Corporation's publication entitled "ESCON and FICON Channel-to-Channel Reference" (IBM Publication No. SB10-7034-01, Second Edition, October 2002), which The entire text is hereby incorporated by reference. Furthermore, the computing environment may fo...

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Abstract

Validation of a re-initialized CTC connection between a first channel and a second channel is provided in a computing environment in which a CTC CU function can be provided in either channel after initialization of the CTC connection and can move from one channel to the other after re-initialization of the connection. After initialization, a newly formatted CDR having a device NED and a specific NEQ is stored. After re-initialization, a current CDR with the same format is obtained. The re-initialized CTC connection is validated if the stored set of NED and NEQ values match the current values, in any order.

Description

technical field [0001] The present invention relates generally to channel subsystems, and more particularly to validating re-initialized channel-to-channel (CTC) connections using a CTC control unit active on one of the channels of the channel-to-channel (CTC) connection. Background of the invention [0002] Channel-to-channel (CTC) adapters have been used for many years as a common communication mechanism between computer systems. For example, CTC adapters are the primary mechanism used to connect multiple S / 390 systems and Z-Series (zSeries, supplied by International Business Machines (IBM) Corporation, Armonk, New York) mainframes together in a homogeneous environment. S / 390 and Z series mainframes can also be connected to other heterogeneous environments, such as IBM's RS / 6000 and / or AS / 400 systems. CTC adapters are end user protocol independent and have wide application eg in the field of multiprocessor system connectivity as well as traditional communication protocol ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/12G06F13/00G06F15/16G06F15/163H04L12/00
CPCH04L12/00
Inventor P·G·德里费尔J·R·弗拉纳根K·M·特罗韦尔H·M·尤登弗兰德
Owner INT BUSINESS MASCH CORP
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