International Business Machines Corporation

Laura J Merritt

Robert Francis Bartfai

Kevin J Reilly

John Divirgilio

John W Doxtader

Nicholas P Rash

Peter J LeVangia

Messages are sent from a primary node of a computer system to one or more distribution nodes of the system. Each of the distribution nodes then further sends the message to one or more other nodes of the computer system. After receipt of the message, the other nodes forward an acknowledgement to the particular distribution node, which sent the message. The distribution nodes collect their respective acknowledgements, and when all of the expected acknowledgements are received by a distribution node, the distribution node sends one acknowledgement to the primary node. The one acknowledgement indicates receipt of the message by the other nodes.

Message distribution capability which uses distribution nodes to collect

An apparatus for synchronizing operator commands with a failover process in a distributed system having a control workstation and a plurality of nodes. One of the nodes of the distributed system is designated a primary node and one of the nodes is designated a backup node. The backup node includes a backup daemon for performing a failover process if the primary node fails such that the backup node becomes the primary node. Shell scripts send a command string to be synchronized with the operation of the backup daemon from the control workstation to the backup node. The backup daemon is then checked to determine if the backup daemon is sleeping, and, in the event the backup daemon is sleeping, commands derived from the command string are enqueued in a work queue for processing by the backup daemon. The backup daemon is then awakened such that the derived commands in the work queue are processed. In the event that the backup daemon is busy, commands derived from the command string are failed, thereby synchronizing the derived commands with the processing of the backup daemon.

Apparatus for synchronizing operator initiated commands with a failover

A method and program product for synchronizing operator commands with a failover process in a distributed system having a control workstation and a plurality of nodes. One of the nodes of the distributed system is designated a primary node and one of the nodes is designated a backup node. The backup node includes a backup daemon for performing a failover process if the primary node fails such that the backup node becomes the primary node. Shell scripts send a command string to be synchronized with the operation of the backup daemon from the control workstation to the backup node. The backup daemon is then checked to determine if the backup daemon is sleeping, and, in the event the backup daemon is sleeping, commands derived from the command string are enqueued in a work queue for processing by the backup daemon. The backup daemon is then awakened such that the derived commands in the work queue are processed. In the event that the backup daemon is busy, commands derived from the command string are failed, thereby synchronizing the derived commands with the processing of the backup daemon.

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Wappingers Falls, NY, United States of America

Laura J Merritt