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Master-Election Algorithm for OES 11 and Earlier Ask node with highest IP address to be the master Master heartbeat? Yes No Higher IP addresses? No Yes.

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Presentation on theme: "Master-Election Algorithm for OES 11 and Earlier Ask node with highest IP address to be the master Master heartbeat? Yes No Higher IP addresses? No Yes."— Presentation transcript:

1 Master-Election Algorithm for OES 11 and Earlier Ask node with highest IP address to be the master Master heartbeat? Yes No Higher IP addresses? No Yes Multiple masters? Promote self as a master candidate Old master? Yes Highest IP address? No Yes Master No SBD fences the master candidate and nodes in its group SBD Tiebreaker No IP addresses of remaining nodes Start master election NIC working? Yes No IP addresses of all cluster nodes Remove IP address of the non-responsive node

2 New Master-Election Algorithm for OES 11 SP1 Ask node with highest IP address to be the master Master heartbeat? Yes No Higher IP addresses? No Yes Multiple masters? Promote self as a master candidate Old master? Yes Highest IP address? No Yes Master No SBD fences the master candidate and nodes in its group SBD Tiebreaker No IP addresses of responsive cluster nodes Ping all cluster nodes Start master election NIC working? Yes No IP addresses of all cluster nodes Remove IP addresses of cluster nodes that did not ping or reply to ping Remove IP address of the non-responsive node

3 Master-Election Algorithm for OES 11 and Earlier Ask node with highest IP address to be the master Master heartbeat? Yes No Higher IP addresses? No Yes Multiple masters? Promote self as a master candidate Yes Master No Fence the losing master candidate and nodes in its group IP addresses of remaining nodes Start master election NIC working? Yes No IP addresses of all cluster nodes Remove IP address of the non-responsive node SBD WinnerLoser

4 New Master-Election Algorithm for OES 11 SP1 Ask node with highest IP address to be the master Master heartbeat? Yes No Higher IP addresses? No Yes Multiple masters? Promote self as a master candidate Yes No IP addresses of responsive cluster nodes Ping all cluster nodes Start master election NIC working? Yes No IP addresses of all cluster nodes Remove IP addresses of cluster nodes that did not ping or reply to ping Remove IP address of the non-responsive node Master Fence the losing master candidate and nodes in its group SBD WinnerLoser


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