Topological sorting of large networks
Communications of the ACM
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Starting/stopping a whole cluster or a part of it is a real challenge considering the different commands related to various device types and manufacturers, and the order that should be respected. This article presents a solution called the sequencer that allows the automatic shutting down and starting up of clusters, subset of clusters or even data-centers. It provides two operation modes designed for ease of use and emergency conditions. Our product has been designed to be efficient and it is currently used to power on and power off one of the largest cluster in the world: the Tera-100, made of more than 4000 nodes.