International Business Machines Corporation

Maoyun Tang

Todd Charles Sorenson

Trung Ngoc Nguyen

Kevin J Ash

Matthew John Ward

Joshua J Crawford

Larry Juarez

Gary William Batchelor

Matthew D Carson

Seamus Burke

Ya-Huey Juan

Sean Patrick Riley

Jay T Kirch

David Fei

A method is disclosed to identify a port that is associated with a faulty cable. In one embodiment, such a method identifies a cable to replace. The cable provides a path between a first port, residing on a first component, and a second port, residing on a second component. The method further identifies whether an alternative path, bypassing the first cable, exists between the first component and the second component. In the event the alternative path exists, the method sends, over the alternative path, from the first component to the second component, a command to activate an indicator on the second port. This command is received and executed by the second component to activate the indicator. A corresponding apparatus and computer program product are also disclosed.

Indicator activation over an alternative cable path

Event detection logic detects events which may be associated with a change in risk of potential data loss in a data replication system. Mode selection logic is responsive to detection of such an event to select a data replication mode such as a synchronous data replication mode, for example, as a function of a detected event for initiation of a switch to the selected mode. In one embodiment, upon detecting that the event which lead to initiation of a switch to the synchronous mode has been completed or otherwise resolved, the mode selection logic can initiation of a switch of the data replication mode of multi-mode data replication logic back to an asynchronous mode so that data is replicated in the asynchronous data replication mode. Other features and aspects may be realized, depending upon the particular application.

Multi-mode data replication for data loss risk reduction

A determination is made of a plurality of components whose states are to be determined to generate a statesave. At least one central processing unit that determines a state of a first component of the plurality of components faster than other central processing units is assigned to determine the state of the first component to include in the statesave, where more processing operations have to be performed to determine the state of the first component in comparison to any other component of the plurality of component. One or more of the other central processing units are assigned to other components of the plurality of components to determine states of the other components to include in the statesave.

Preferential allocation of processors for statesave in a storage controller

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Chandler, AZ, United States of America

Maoyun Tang