What is the tiebreaker IP meaning?

[yongye_1]

Hi,

I use the redhat-config-cluster to configure my AS3 cluster. I am confused with some parameter under cluquorumd configuration windows. There are two options, Ping interval and Tiebreaker IP. I really don't know what is the Tiebreaker IP and how it works. Is it an IP of a cluster member? Who can give me a clear definition for Tiebreaker IP? Thanks in advance.

Yongye

[vetriselvan s]

The tiebreaker is the IP address of a machine or a router that does not participate in the cluster. Usually, it is the IP address of a network router that connects the members to the external world (clients).

In the GUI:

Cluster -> Daemon properties -> cluquorumd

In the CLI:
redhat-config-cluster-cmd --cluquorumd --tiebreaker_ip=IPaddress

[vetriselvan s]

Tiebreaker IP is a network-based heartbeat used to determine quorum, which is the ability to run services. The tiebreaker IP address is only checked when the cluster has an even split in a two- or four-member cluster. This IP address should be associated with a router that, during normal operation, can be reached by all members over the Ethernet interface used by the cluster software.


for ur Problem See

http://www.startcom.org/docs/en/ClusterConfiguration Tool and Cluster Status Tool/s1-config-cluquorumd.html

[yongye_1]

Thanks for your reply. But I still don't know how does it work. Could you please give me a more detailed explaination. Thank you very much.

Yongye

[vetriselvan s]

Tiebreaker
A node that is participating the cluster membership. FailSafe tries to include the tiebreaker node in the membership in case of split-brain scenarios.
The IP address of machine or a router that does not participate in the cluster membership. Usually it is the IP address of a network router that connects the SGI Cluster Manager members to the external world (clients). In a split-brain scenario, only those members that can contact the tiebreaker IP address can form a cluster.


U can See the Document
http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi?coll=linux&db=bks&srch=&fname=/SGI_Admin/HACM_AG/sgi_html/apa.html

[Jean-Luc Oudart]

Hi,

check this link. Hope this helps

http://jamesthornton.com/redhat/linux/Enterprise/3/Cluster-Guide/s1-swinfo-twofourmem.html

Regards
Jean-Luc

[rodgersr]

This doe s not explaing how if in a two node cluster when both can reach the tiebreaker what determines who will become the active node?