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WARNING, AGAIN: if for some reason the node you are failing over from
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actually returns on its own without you being able to stop it, it
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may run those DRBD disks and virtual machines, and you *may* end
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up in a split brain scenario.
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up in a split brain scenario. Normally, the node asks the master for
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which VM to start, so it should be safe to failover from a node that
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is NOT the master, but make sure the rest of the cluster is healthy
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before going ahead with this procedure.
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If, say, `fsn-node-07` completely fails and you need to restore
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service to the virtual machines running on that server, you can
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