Method of solving a split-brain condition

Details Method of solving a split-brain condition Method of solving a split-brain condition

2005-04-07

2010-11-30

Ryman, Daniel J (Department: 2466)

Multiplex communications

Fault recovery

Bypass an inoperative station

C370S242000, C370S248000, C714S004110

Reexamination Certificate

active

07843811

ABSTRACT:
In a cluster system comprising at least two nodes connected via a communication network and having a name and a host weight assigned to it, a method is implemented comprising the steps of inspecting the communication link, determining which node has to be shut down after a failure, creating an advertisement report for the node to be shut down, sending the advertisement report to at least one node of the cluster system, calculating a delay time depending on the weight of the first node and sending the shut down command to the node for which a failure report was received. In one embodiment of the invention the advertisement reports include a master node, which allows identifying and specifying the surviving subcluster. The method will send shut down signals to those nodes of a subcluster with lower weight than the surviving subcluster. A failsafe mechanism is implemented.

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Fujitsu Siemens Computers, PRIMECLUSTER for mySAP Business Suite, Shutdown Facility (SF) (Linux), Configuration and Administration Guide, pp. 1-70, Oct. 2003.
Fujitsu Siemens Computer: “Primecluster for mySAP Business Suite, Shutdown Facility (SF) (Linux), Configuration and Administration Guide”, White Paper, Oct. 2003, pp. 1-70.

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