Howto restart a MySQL MMM cluster

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http://serverfault.com – little theoretical question. I'm done setting up a bunch of 2-node MySQL 5.1 clusters user the control of several MMM instances. We started some testing, joyously kill -9 the writer nodes and all went fine with the app chugging along, oblivious of the DBMS turmoils. Then I thought, what if in production first server A goes down, server B takes over and more work is done, and finally B goes down as well. If the sysadmin restarts the cluster first from A and later joins B while in the meantime work is done on the outdated data of A? Does MySQL have a quorum mechanism that keeps A (or even B) (HowTos)