Method and program product for synchronizing operator initiated

Details Method and program product for synchronizing operator initiated Method and program product for synchronizing operator initiated

1997-03-27

1999-02-23

Kim, Kenneth S.

39518202, 39518208, G06F 1122

Patent

active

058752900

ABSTRACT:
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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"Supervisor Recovery in Ring Networks", A. Goyal and R. Nelson, IBM Technical Disclosure Bulletin, vol. 27, No. 8, Jan. 1865, pp. 4715-4717.

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