[Linux-cluster] How does disk prevent split brain?

[Rick Rodgers]

According to RH documentation and the engineers you can have a safe two node 
cluster without having to have an ip-tiebreaker. They say it will use the disk tie-breaker.

How is this possible?  Since clulockd is running separately on each of the nodes how does
it prevent each node from accessing the disk at the same time and declaring himself the 
Active node? If it is through some sort of locking mechanism that insures this can you please
be technically specific in what it is?



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