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In many cases multiple partitions draw from the same pool of nodes, and MSI balances each partition to ensure that jobs from one partition don't hog all of the nodes in the shared pool. It is not possible to determine how many nodes are busy and available in the individual partitions.:
Note that the scheduler may not assign a job to an idle node, if nodes are reserved for an upcoming maintenance day or idle nodes are being accumulated for a large job, for example. The down state indicates the node has crashed, is offline for maintenance, or is not available for other reasons.