Reply to post: Re: Mirrored systems

REVEALED: Titsup flight plan mainframe borks UK air traffic control

Alan Brown Silver badge

Re: Mirrored systems

" If you go for powering down the failed system (AKA "shoot it in the head", zombie apocalypse style) to be damned sure its not meddling with shared stuff, how do you then avoid the risk of mutually assured destruction if both lose the heartbeat link and more or less simultaneously kill the other?"

That one's simple (I have to deal with STONITH systems on a daily basis) - set differing delay periods on each node, based on prime numbers. That way you can be sure that one will always win in such a situation instead of a mexican standoff result.

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