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Re: [Linux-cluster] qdisk WITHOUT fencing



On 18/06/2010 00:46, Joseph L. Casale wrote:

You can make use of whatever technologies you want such as iptables, switch
ports etc in your own script and return a "success" to the fenced so things
carry on.

Absolutely. Many things can be used to provide reliable fencing.

I use drbd between my two node w/o a qdisc and have drbd play a role in mitigating
the issues you describe. My two nodes are also separated by fiber and I
encountered the same issue where one node might be able to fence the other
properly.

Sure, DRBD can assume it's primary after a timeout when the peer goes away, but the stonith option is there for a reason. Ultimately, when the other node re-joins, one DRBD instance will "win", and the other will sync to it. If something else was accessing it at the time, it'll have the rug pulled out from under it when it's FS consistency suddenly goes down the pan.

Gordan


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